psychological science disscussions

psychological science disscussions

 

 

There are two discussions in which both must be answered.

 

1)  Why We Sleep and Sleep Deprivation

Good News! Psychologists have discovered a treatment that strengthens memory, increases concentration, boosts mood, moderates hunger and obesity, fortifies the disease-fighting immune system and lessens the risk of fatal accidents. Even better news: The treatment feels good, it can be self-administered, the supplies are limitless, and its available free! (Myers, 2010, p. 97)    Myers is talking the benefits of SLEEP.

For this activity, take the Are You Sleep Deprived Test  (attached)and the Sleep Strategies Test (below)

Are You Sleep Deprived?

or click on or cut and paste this link: https://learn.umuc.edu/content/enforced/12642-006698-01-2142-OL1-6382/Are%20you%20Sleep%20Deprived.pdf?_&d2lSessionVal=6tj6dhmd37gg6ccJ7LaKjaj9Z

Next, read e-Reading Chapt 5, “Consciousness”, Section 1.1 to 1.3  and come in and answer at least 2 of the following questions.

1. How did you score on these tests? Are you sleep deprived and do you have good sleep strategies?

2. If you are sleep deprived, discuss possible steps you could take to improve your sleep (see your textbook for some tips). If you are not sleep deprived, tell us what your sleep strategies are. Please reference the text in your answer.

3. Why do sleep patterns and duration vary from person to person? What is sleep debt? Can you catch up? Search the internet for an answer to this one.

4. Discuss several risks associated with sleep deprivation. Have you personally experienced any of these risks?

5. Briefly identify the theories of why we sleep (search the internet for possibilities).

 

How Good Are My Sleep Strategies?

T  F   1. I go to bed at different times during the week and on weekends, depending on my schedule and social life.

T  F   2.  I get up at different times during the week and on weekends, depending on my schedule and social life.

T  F   3.  My bedroom is warm or often noisy.

T  F   4.  I never rotate or flip my mattress.

T  F   5.  I drink alcohol within two hours of bedtime.

T  F   6.  I have caffeinated coffee, tea, colas, or chocolate after 6 P.M.

T  F    7.  I do not exercise on a regular basis.

T  F    8.  I smoke

T  F    9.  I regularly take over-the-counter or prescription medication to help me sleep.

T  F   10.  When I cannot fall asleep or remain asleep, I stay in bed and try harder.

T  F   11.  I often read frightening or troubling books or newspaper articles right before bedtime.

T  F   12.  I do work or watch the news in bed just before turning out the lights.

T  F   13.  My bed partner keeps me awake by his/her snoring.

T  F   14.  My bed partner tosses and turns or kicks/hits me during his/her sleep.

T  F   15.  I argue with my bed partner in bed.

Note:  According to Mass and Wherry (1998), a “true” answer to one or more of these items indicates that some aspects of a person’s life-style are interfering with his or her sleep.

Source:  Mass, J. B. & Wherry, M. L. (1998).  Power Sleep:  The Revoluntary Program That Prepares Your Mind for Real Performance.  New York: Villard Books, Random House.

 

 2) Meditation

Class,

Psychologists and physicians are finding that mediation can be extremely beneficial for our mental and physical health. Of course, exercise and eating right can be beneficial as well, but meditation has just recently gained momentum, although it has been with us a long time. Take a look at the e-Readings Chapter 5 on “Consciousness” Sec 3.3.

Your assignment:  Watch these two short videos by experts in the field of Mindfulness (meditation) and try one of the two meditations below and tell us what you think.  You can post another meditation for us if you wish instead.

 

1)  Professor Jon Kabat Zin on the Science of Mindfulness:  https://www.youtube.com/watch?v=EU7vKitN4Ro

1) Professor Mark Williams,The Science of Mindfulness (3:35 min) https://www.youtube.com/watch?v=8GVwnxkWmSM

2) Professor Jon Kabat-Zin (2:11 min): The Science of Mindfulness: https://www.youtube.com/watch?v=AJ2kbOPbrNI

If you have not meditated before, or even if you have, see what you think of this video and/or the next.  Or provide us with one you like.

1) Professor Mark Williams: Guided Meditation (3:20 min):  https://www.youtube.com/watch?v=CVW_IE1nsKE

2) This longer meditation is one from your textbook (10 min): https://youtube.googleapis.com/v/qs_DuZigRzY

If you have other videos or insight about meditation, please share with us.

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This text was adapted by The Saylor Foundation under a Creative Commons

Attribution-NonCommercial-ShareAlike 3.0 License without attribution as

requested by the work’s original creator or licensee.

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Chapter 5

States of Consciousness An Unconscious Killing

During the night of May 23, 1987, Kenneth Parks, a 23-year old Canadian with a wife, a baby daughter, and heavy

gambling debts, got out of his bed, climbed into his car, and drove 15 miles to the home of his wife’s parents in the

suburbs of Toronto. There, he attacked them with a knife, killing his mother-in-law and severely injuring his father-

in-law. Parks then drove to a police station and stumbled into the building, holding up his bloody hands and saying, “I

think I killed some people…my hands.” The police arrested him and took him to a hospital, where surgeons repaired

several deep cuts on his hands. Only then did police discover that he had indeed assaulted his in-laws.

Parks claimed that he could not remember anything about the crime. He said that he remembered going to sleep in

his bed, then awakening in the police station with bloody hands, but nothing in between. His defense was that he had

been asleep during the entire incident and was not aware of his actions (Martin, 2009). [1]

Not surprisingly, no one believed this explanation at first. However, further investigation established that he did have

a long history of sleepwalking, he had no motive for the crime, and despite repeated attempts to trip him up in

numerous interviews, he was completely consistent in his story, which also fit the timeline of events. Parks was

examined by a team of sleep specialists, who found that the pattern of brain waves that occurred while he slept was

very abnormal (Broughton, Billings, Cartwright, & Doucette, 1994). [2]

The specialists eventually concluded that

sleepwalking, probably precipitated by stress and anxiety over his financial troubles, was the most likely explanation

of his aberrant behavior. They also agreed that such a combination of stressors was unlikely to happen again, so he

was not likely to undergo another such violent episode and was probably not a hazard to others. Given this

combination of evidence, the jury acquitted Parks of murder and assault charges. He walked out of the courtroom a

free man (Wilson, 1998). [3]

Consciousness is defined as our subjective awareness of ourselves and our environment (Koch,

2004). [4]

The experience of consciousness is fundamental to human nature. We all know what it

means to be conscious, and we assume (although we can never be sure) that other human beings

experience their consciousness similarly to how we experience ours.

The study of consciousness has long been important to psychologists and plays a role in many

important psychological theories. For instance, Sigmund Freud’s personality theories

differentiated between the unconscious and the conscious aspects of behavior, and present-day

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psychologists distinguish betweenautomatic (unconscious) and controlled (conscious) behaviors

and betweenimplicit (unconscious) and explicit (conscious) memory (Petty, Wegener, Chaiken,

& Trope, 1999; Shanks, 2005). [5]

Some philosophers and religious practices argue that the mind (or soul) and the body are separate

entities. For instance, the French philosopher René Descartes (1596–1650) was a proponent

of dualism, the idea that the mind, a nonmaterial entity, is separate from (although connected to)

the physical body. In contrast to the dualists, psychologists believe that consciousness (and thus

the mind) exists in the brain, not separate from it. In fact, psychologists believe that

consciousness is the result of the activity of the many neural connections in the brain, and that

we experience different states of consciousness depending on what our brain is currently doing

(Dennett, 1991; Koch & Greenfield, 2007). [6]

The study of consciousness is also important to the fundamental psychological question

regarding the presence of free will. Although we may understand and believe that some of our

behaviors are caused by forces that are outside our awareness (i.e., unconscious), we

nevertheless believe that we have control over, and are aware that we are engaging in, most of

our behaviors. To discover that we, or even someone else, has engaged in a complex behavior,

such as driving in a car and causing severe harm to others, without being at all conscious of

one’s actions, is so unusual as to be shocking. And yet psychologists are increasingly certain that

a great deal of our behavior is caused by processes of which we are unaware and over which we

have little or no control (Libet, 1999; Wegner, 2003). [7]

Our experience of consciousness is functional because we use it to guide and control our

behavior, and to think logically about problems (DeWall, Baumeister, & Masicampo,

2008). [8]

Consciousness allows us to plan activities and to monitor our progress toward the goals

we set for ourselves. And consciousness is fundamental to our sense of morality—we believe

that we have the free will to perform moral actions while avoiding immoral behaviors.

But in some cases consciousness may become aversive, for instance when we become aware that

we are not living up to our own goals or expectations, or when we believe that other people

perceive us negatively. In these cases we may engage in behaviors that help us escape from

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consciousness, for example through the use of alcohol or other psychoactive drugs (Baumeister,

1998). [9]

Because the brain varies in its current level and type of activity, consciousness is transitory. If we

drink too much coffee or beer, the caffeine or alcohol influences the activity in our brain, and our

consciousness may change. When we are anesthetized before an operation or experience a

concussion after a knock on the head, we may lose consciousness entirely as a result of changes

in brain activity. We also lose consciousness when we sleep, and it is with this altered state of

consciousness that we begin our chapter.

[1] Martin, L. (2009). Can sleepwalking be a murder defense? Sleep Disorders: For Patients and Their Families. Retrieved

from http://www.lakesidepress.com/pulmonary/Sleep/sleep-murder.htm

[2] Broughton, R. J., Billings, R., Cartwright, R., & Doucette, D. (1994). Homicidal somnambulism: A case report. Sleep: Journal of

Sleep Research & Sleep Medicine, 17(3), 253–264.

[3] Wilson, C. (1998). The mammoth book of true crime. New York, NY: Robinson Publishing.

[4] Koch, C. (2004). The quest for consciousness: A neurobiological approach. Englewood, CO: Roberts & Co.

[5] Petty, R., Wegener, D., Chaiken, S., & Trope, Y. (1999). Dual-process theories in social psychology. New York, NY: Guilford

Press; Shanks, D. (2005). Implicit learning. In K. Lamberts (Ed.), Handbook of cognition (pp. 202–220). London, England: Sage.

[6] Dennett, D. C. (1991). Consciousness explained. Boston, MA: Little, Brown and Company; Koch, C., & Greenfield, S. (2007).

How does consciousness happen? Scientific American, 76–83.

[7] Libet, B. (1999). Do we have free will? Journal of Consciousness Studies, 6, 8(9), 47–57; Wegner, D. M. (2003). The mind’s

best trick: How we experience conscious will. Trends in Cognitive Sciences, 7(2), 65–69.

[8] DeWall, C., Baumeister, R., & Masicampo, E. (2008). Evidence that logical reasoning depends on conscious

processing. Consciousness and Cognition, 17(3), 628.

[9] Baumeister, R. (1998). The self. In The handbook of social psychology (4th ed., Vol. 2, pp. 680–740). New York, NY: McGraw-

Hill.

5.1 Sleeping and Dreaming Revitalize Us for Action L E A R N I N G O B J E C T I V E S

1. Draw a graphic showing the usual phases of sleep during a normal night and notate the characteristics of each phase.

2. Review the disorders that affect sleep and the costs of sleep deprivation.

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3. Outline and explain the similarities and differences among the different theories of dreaming.

The lives of all organisms, including humans, are influenced by regularly occurring cycles of

behaviors known as biological rhythms. One important biological rhythm is the annual cycle that

guides the migration of birds and the hibernation of bears. Women also experience a 28-day

cycle that guides their fertility and menstruation. But perhaps the strongest and most important

biorhythm is the daily circadian rhythm (from the Latin circa, meaning ―about‖ or

―approximately,‖ and dian, meaning ―daily‖) that guides the daily waking and sleeping cycle in

many animals.

Many biological rhythms are coordinated by changes in the level and duration of ambient light,

for instance, as winter turns into summer and as night turns into day. In some animals, such as

birds, the pineal gland in the brain is directly sensitive to light and its activation influences

behavior, such as mating and annual migrations. Light also has a profound effect on humans. We

are more likely to experience depression during the dark winter months than during the lighter

summer months, an experience known as seasonal affective disorder (SAD), and exposure to

bright lights can help reduce this depression (McGinnis, 2007). [1]

Sleep is also influenced by ambient light. The ganglion cells in the retina send signals to a brain

area above the thalamus called the suprachiasmatic nucleus, which is the body’s primary

circadian ―pacemaker.‖ The suprachiasmatic nucleus analyzes the strength and duration of the

light stimulus and sends signals to the pineal gland when the ambient light level is low or its

duration is short. In response, the pineal gland secretes melatonin, a powerful hormone that

facilitates the onset of sleep.

Research Focus: Circadian Rhythms Influence the Use of Stereotypes in Social Judgments

The circadian rhythm influences our energy levels such that we have more energy at some times of day than others.

Galen Bodenhausen (1990) [2]

argued that people may be more likely to rely on their stereotypes (i.e., their beliefs

about the characteristics of social groups) as a shortcut to making social judgments when they are tired than when

they have more energy. To test this hypothesis, he asked 189 research participants to consider cases of alleged

misbehavior by other college students and to judge the probability of the accused students’ guilt. The accused

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students were identified as members of particular social groups, and they were accused of committing offenses that

were consistent with stereotypes of these groups.

One case involved a student athlete accused of cheating on an exam, one case involved a Hispanic student who

allegedly physically attacked his roommate, and a third case involved an African American student who had been

accused of selling illegal drugs. Each of these offenses had been judged via pretesting in the same student population

to be stereotypically (although, of course, unfairly) associated with each social group. The research participants were

also provided with some specific evidence about the case that made it ambiguous whether the person had actually

committed the crime, and then asked to indicate the likelihood of the student’s guilt on an 11-point scale (0 =

extremely unlikely to 10 = extremely likely).

Participants also completed a measure designed to assess their circadian rhythms—whether they were more active

and alert in the morning (Morning types) or in the evening (Evening types). The participants were then tested at

experimental sessions held either in the morning (9 a.m.) or in the evening (8 p.m.). As you can see in Figure 5.2

“Circadian Rhythms and Stereotyping”, the participants were more likely to rely on their negative stereotypes of the

person they were judging at the time of day in which they reported being less active and alert. Morning people used

their stereotypes more when they were tested in the evening, and evening people used their stereotypes more when

they were tested in the morning.

Sleep Stages: Moving Through the Night

Although we lose consciousness as we sleep, the brain nevertheless remains active. The patterns

of sleep have been tracked in thousands of research participants who have spent nights sleeping

in research labs while their brain waves were recorded by monitors, such as

an electroencephalogram, or EEG(Figure 5.3 “Sleep Labs”).

Sleep researchers have found that sleeping people undergo a fairly consistent pattern of sleep

stages, each lasting about 90 minutes. As you can see in Figure 5.4 “Stages of Sleep”, these

stages are of two major types: Rapid eye movement (REM) sleep is a sleep stage characterized

by the presence of quick fast eye movements and dreaming. REM sleep accounts for about 25%

of our total sleep time. During REM sleep, our awareness of external events is dramatically

reduced, and consciousness is dominated primarily by internally generated images and a lack of

overt thinking (Hobson, 2004). [3]

During this sleep stage our muscles shut down, and this is

probably a good thing as it protects us from hurting ourselves or trying to act out the scenes that

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are playing in our dreams. The second major sleep type, non-rapid eye movement (non-

REM) sleep is a deep sleep, characterized by very slow brain waves, that is further subdivided

into three stages: N1, N2, and N3. Each of the sleep stages has its own distinct pattern of brain

activity (Dement & Kleitman, 1957). [4]

Figure 5.4 Stages of Sleep

6

During a typical night, our sleep cycles move between REM and non-REM sleep, with each cycle repeating at about

90-minute intervals. The deeper non-REM sleep stages usually occur earlier in the night.

As you can see in Figure 5.5 “EEG Recordings of Brain Patterns During Sleep”, the brain waves

that are recorded by an EEG as we sleep show that the brain’s activity changes during each stage

of sleeping. When we are awake, our brain activity is characterized by the presence of very

fast beta waves. When we first begin to fall asleep, the waves get longer (alpha waves), and as

we move into stage N1 sleep, which is characterized by the experience of drowsiness, the brain

begins to produce even slower theta waves. During stage N1 sleep, some muscle tone is lost, as

well as most awareness of the environment. Some people may experience sudden jerks or

twitches and even vivid hallucinations during this initial stage of sleep.

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Figure 5.5 EEG Recordings of Brain Patterns During Sleep

Each stage of sleep has its own distinct pattern of brain activity.

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Normally, if we are allowed to keep sleeping, we will move from stage N1 to stage N2 sleep.

During stage N2, muscular activity is further decreased and conscious awareness of the

environment is lost. This stage typically represents about half of the total sleep time in normal

adults. Stage N2 sleep is characterized by theta waves interspersed with bursts of rapid brain

activity known as sleep spindles.

Stage N3, also known as slow wave sleep, is the deepest level of sleep, characterized by an

increased proportion of very slow delta waves. This is the stage in which most sleep

abnormalities, such as sleepwalking, sleeptalking, nightmares, and bed-wetting occur. The

sleepwalking murders committed by Mr. Parks would have occurred in this stage. Some skeletal

muscle tone remains, making it possible for affected individuals to rise from their beds and

engage in sometimes very complex behaviors, but consciousness is distant. Even in the deepest

sleep, however, we are still aware of the external world. If smoke enters the room or if we hear

the cry of a baby we are likely to react, even though we are sound asleep. These occurrences

again demonstrate the extent to which we process information outside consciousness.

After falling initially into a very deep sleep, the brain begins to become more active again, and

we normally move into the first period of REM sleep about 90 minutes after falling asleep. REM

sleep is accompanied by an increase in heart rate, facial twitches, and the repeated rapid eye

movements that give this stage its name. People who are awakened during REM sleep almost

always report that they were dreaming, while those awakened in other stages of sleep report

dreams much less often. REM sleep is also emotional sleep. Activity in the limbic system,

including the amygdala, is increased during REM sleep, and the genitals become aroused, even if

the content of the dreams we are having is not sexual. A typical 25-year-old man may have an

erection nearly half of the night, and the common ―morning erection‖ is left over from the last

REM period before waking.

Normally we will go through several cycles of REM and non-REM sleep each night (Figure 5.5

“EEG Recordings of Brain Patterns During Sleep”). The length of the REM portion of the cycle

tends to increase through the night, from about 5 to 10 minutes early in the night to 15 to 20

minutes shortly before awakening in the morning. Dreams also tend to become more elaborate

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and vivid as the night goes on. Eventually, as the sleep cycle finishes, the brain resumes its faster

alpha and beta waves and we awake, normally refreshed.

Sleep Disorders: Problems in Sleeping

According to a recent poll (National Sleep Foundation, 2009), [5]

about one-fourth of American

adults say they get a good night’s sleep only a few nights a month or less. These people are

suffering from a sleep disorder known asinsomnia, defined as persistent difficulty falling or

staying asleep. Most cases of insomnia are temporary, lasting from a few days to several weeks,

but in some cases insomnia can last for years.

Insomnia can result from physical disorders such as pain due to injury or illness, or from

psychological problems such as stress, financial worries, or relationship difficulties. Changes in

sleep patterns, such as jet lag, changes in work shift, or even the movement to or from daylight

savings time can produce insomnia. Sometimes the sleep that the insomniac does get is disturbed

and nonrestorative, and the lack of quality sleep produces impairment of functioning during the

day. Ironically, the problem may be compounded by people’s anxiety over insomnia itself: Their

fear of being unable to sleep may wind up keeping them awake. Some people may also develop a

conditioned anxiety to the bedroom or the bed.

People who have difficulty sleeping may turn to drugs to help them sleep. Barbiturates,

benzodiazepines, and other sedatives are frequently marketed and prescribed as sleep aids, but

they may interrupt the natural stages of the sleep cycle, and in the end are likely to do more harm

than good. In some cases they may also promote dependence. Most practitioners of sleep

medicine today recommend making environmental and scheduling changes first, followed by

therapy for underlying problems, with pharmacological remedies used only as a last resort.

According to the National Sleep Foundation, some steps that can be used to combat insomnia

include the following:

 Use the bed and bedroom for sleep and sex only. Do not spend time in bed during the

day.

 Establish a regular bedtime routine and a regular sleep-wake schedule.

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 Think positively about your sleeping—try not to get anxious just because you are losing a

little sleep.

 Do not eat or drink too much close to bedtime.

 Create a sleep-promoting environment that is dark, cool, and comfortable.

 Avoid disturbing noises—consider a bedside fan or white-noise machine to block out

disturbing sounds.

 Consume less or no caffeine, particularly late in the day.

 Avoid alcohol and nicotine, especially close to bedtime.

 Exercise, but not within 3 hours before bedtime.

 Avoid naps, particularly in the late afternoon or evening.

 Keep a sleep diary to identify your sleep habits and patterns that you can share with your

doctor.

Another common sleep problem is sleep apnea, a sleep disorder characterized by pauses in

breathing that last at least 10 seconds during sleep(Morgenthaler, Kagramanov, Hanak, &

Decker, 2006). [6]

In addition to preventing restorative sleep, sleep apnea can also cause high

blood pressure and may raise the risk of stroke and heart attack (Yaggi et al., 2005). [7]

Most sleep apnea is caused by an obstruction of the walls of the throat that occurs when we fall

asleep. It is most common in obese or older individuals who have lost muscle tone and is

particularly common in men. Sleep apnea caused by obstructions is usually treated with an air

machine that uses a mask to create a continuous pressure that prevents the airway from

collapsing, or with mouthpieces that keep the airway open. If all other treatments have failed,

sleep apnea may be treated with surgery to open the airway.

Narcolepsy is a disorder characterized by extreme daytime sleepiness with frequent episodes of

“nodding off.” The syndrome may also be accompanied by attacks of cataplexy, in which the

individual loses muscle tone, resulting in a partial or complete collapse. It is estimated that at

least 200,000 Americans suffer from narcolepsy, although only about a quarter of these people

have been diagnosed (National Heart, Lung, and Blood Institute, 2008). [8]

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Narcolepsy is in part the result of genetics—people who suffer from the disease lack

neurotransmitters that are important in keeping us alert (Taheri, Zeitzer, & Mignot, 2002) [9]

and is also the result of a lack of deep sleep. While most people descend through the sequence of

sleep stages, then move back up to REM sleep soon after falling asleep, narcolepsy sufferers

move directly into REM and undergo numerous awakenings during the night, often preventing

them from getting good sleep.

Narcolepsy can be treated with stimulants, such as amphetamines, to counteract the daytime

sleepiness, or with antidepressants to treat a presumed underlying depression. However, since

these drugs further disrupt already-abnormal sleep cycles, these approaches may, in the long run,

make the problem worse. Many sufferers find relief by taking a number of planned short naps

during the day, and some individuals may find it easier to work in jobs that allow them to sleep

during the day and work at night.

Other sleep disorders occur when cognitive or motor processes that should be turned off or

reduced in magnitude during sleep operate at higher than normal levels (Mahowald & Schenck,

2000). [10]

One example is somnamulism(sleepwalking), in which the person leaves the bed and

moves around while still asleep. Sleepwalking is more common in childhood, with the most

frequent occurrences around the age of 12 years. About 4% of adults experience somnambulism

(Mahowald & Schenck, 2000). [11]

Sleep terrors is a disruptive sleep disorder, most frequently experienced in childhood, that may

involve loud screams and intense panic. The sufferer cannot wake from sleep even though he or

she is trying to. In extreme cases, sleep terrors may result in bodily harm or property damage as

the sufferer moves about abruptly. Up to 3% of adults suffer from sleep terrors, which typically

occur in sleep stage N3 (Mahowald & Schenck, 2000). [12]

Other sleep disorders include bruxism, in which the sufferer grinds his teeth during

sleep; restless legs syndrome, in which the sufferer reports an itching, burning, or otherwise

uncomfortable feeling in his legs, usually exacerbated when resting or asleep; and periodic limb

movement disorder, which involves sudden involuntary movement of limbs. The latter can cause

sleep disruption and injury for both the sufferer and bed partner.

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Although many sleep disorders occur during non-REM sleep, REM sleep behavior

disorder (Mahowald & Schenck, 2005) [13]

is a condition in which people (usually middle-aged

or older men) engage in vigorous and bizarre physical activities during REM sleep in response to

intense, violent dreams. As their actions may injure themselves or their sleeping partners, this

disorder, thought to be neurological in nature, is normally treated with hypnosis and medications.

The Heavy Costs of Not Sleeping

Our preferred sleep times and our sleep requirements vary throughout our life cycle. Newborns

tend to sleep between 16 and 18 hours per day, preschoolers tend to sleep between 10 and 12

hours per day, school-aged children and teenagers usually prefer at least 9 hours of sleep per

night, and most adults say that they require 7 to 8 hours per night (Mercer, Merritt, & Cowell,

1998; National Sleep Foundation, 2008). [14]

There are also individual differences in need for

sleep. Some people do quite well with fewer than 6 hours of sleep per night, whereas others need

9 hours or more. The most recent study by the National Sleep Foundation suggests that adults

should get between 7 and 9 hours of sleep per night (Figure 5.8 “Average Hours of Required

Sleep per Night”), and yet Americans now average fewer than 7 hours.

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Figure 5.8 Average Hours of Required Sleep per Night

The average U.S. adult reported getting only 6.7 hours of sleep per night, which is less than the recommended range

propose by the National Sleep Foundation.

Source: Adapted from National Sleep Foundation. (2008). Sleep in America Poll. Washington, DC: Author.

Retrieved fromhttp://www.sleepfoundation.org/sites/default/files/2008%20POLL%20SOF.PDF.

Getting needed rest is difficult in part because school and work schedules still follow the early-

to-rise timetable that was set years ago. We tend to stay up late to enjoy activities in the evening

but then are forced to get up early to go to work or school. The situation is particularly bad for

college students, who are likely to combine a heavy academic schedule with an active social life

and who may, in some cases, also work. Getting enough sleep is a luxury that many of us seem

to be unable or unwilling to afford, and yet sleeping is one of the most important things we can

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do for ourselves. Continued over time, a nightly deficit of even only 1 or 2 hours can have a

substantial impact on mood and performance.

Sleep has a vital restorative function, and a prolonged lack of sleep results in increased anxiety,

diminished performance, and, if severe and extended, may even result in death. Many road

accidents involve sleep deprivation, and people who are sleep deprived show decrements in

driving performance similar to those who have ingested alcohol (Hack, Choi, Vijayapalan,

Davies, & Stradling, 2001; Williamson & Feyer, 2000). [15]

Poor treatment by doctors (Smith-

Coggins, Rosekind, Hurd, & Buccino, 1994) [16]

and a variety of industrial accidents have also

been traced in part to the effects of sleep deprivation.

Good sleep is also important to our health and longevity. It is no surprise that we sleep more

when we are sick, because sleep works to fight infection. Sleep deprivation suppresses immune

responses that fight off infection, and can lead to obesity, hypertension, and memory impairment

(Ferrie et al., 2007; Kushida, 2005). [17]

Sleeping well can even save our lives. Dew et al.

(2003) [18]

found that older adults who had better sleep patterns also lived longer.

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Figure 5.9 The Effects of Sleep Deprivation

In 1964, 17-year-old high school student Randy Gardner remained awake for 264 hours (11 days) in order to set a new Guinness

World Record. At the request of his worried parents, he was monitored by a U.S. Navy psychiatrist, Lt. Cmdr. John J. Ross. This

chart maps the progression of his behavioral changes over the 11 days.

Source: Adapted from Ross, J. J. (1965). Neurological findings after prolonged sleep deprivation. Archives of Neurology, 12, 399–

403.

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Dreams and Dreaming

Dreams are the succession of images, thoughts, sounds, and emotions that passes through our

minds while sleeping. When people are awakened from REM sleep, they normally report that

they have been dreaming, suggesting that people normally dream several times a night but that

most dreams are forgotten on awakening (Dement, 1997). [19]

The content of our dreams

generally relates to our everyday experiences and concerns, and frequently our fears and failures

(Cartwright, Agargun, Kirkby, & Friedman, 2006; Domhoff, Meyer-Gomes, & Schredl,

2005). [20]

Many cultures regard dreams as having great significance for the dreamer, either by revealing

something important about the dreamer’s present circumstances or predicting his future. The

Austrian psychologist Sigmund Freud (1913/1988) [21]

analyzed the dreams of his patients to help

him understand their unconscious needs and desires, and psychotherapists still make use of this

technique today. Freud believed that the primary function of dreams was wish fulfillment, or the

idea that dreaming allows us to act out the desires that we must repress during the day. He

differentiated between the manifest content of the dream (i.e., its literal actions) and its latent

content (i.e., the hidden psychological meaning of the dream). Freud believed that the real

meaning of dreams is often suppressed by the unconscious mind in order to protect the individual

from thoughts and feelings that are hard to cope with. By uncovering the real meaning of dreams

through psychoanalysis, Freud believed that people could better understand their problems and

resolve the issues that create difficulties in their lives.

Although Freud and others have focused on the meaning of dreams, other theories about the

causes of dreams are less concerned with their content. One possibility is that we dream

primarily to help with consolidation, or the moving of information into long-term memory

(Alvarenga et al., 2008; Zhang (2004). [22]

Rauchs, Desgranges, Foret, and Eustache

(2005) [23]

found that rats that had been deprived of REM sleep after learning a new task were

less able to perform the task again later than were rats that had been allowed to dream, and these

differences were greater on tasks that involved learning unusual information or developing new

behaviors. Payne and Nadel (2004) [24]

argued that the content of dreams is the result of

consolidation—we dream about the things that are being moved into long-term memory. Thus

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dreaming may be an important part of the learning that we do while sleeping (Hobson, Pace-

Schott, and Stickgold, 2000). [25]

The activation-synthesis theory of dreaming (Hobson & McCarley, 1977; Hobson,

2004) [26]

proposes still another explanation for dreaming—namely, that dreams are our brain’s

interpretation of the random firing of neurons in the brain stem. According to this approach, the

signals from the brain stem are sent to the cortex, just as they are when we are awake, but

because the pathways from the cortex to skeletal muscles are disconnected during REM sleep,

the cortex does not know how to interpret the signals. As a result, the cortex strings the messages

together into the coherent stories we experience as dreams.

Although researchers are still trying to determine the exact causes of dreaming, one thing

remains clear—we need to dream. If we are deprived of REM sleep, we quickly become less able

to engage in the important tasks of everyday life, until we are finally able to dream again.

K E Y T A K E A W A Y S

 Consciousness, our subjective awareness of ourselves and our environment, is functional because it allows us to plan

activities and monitor our goals.

 Psychologists believe the consciousness is the result of neural activity in the brain.

 Human and animal behavior is influenced by biological rhythms, including annual, monthly, and circadian rhythms.

 Sleep consists of two major stages: REM and non-REM sleep. Non-REM sleep has three substages, known as stage N1,

N2, and N3.

 Each sleep stage is marked by a specific pattern of biological responses and brain wave patterns.

 Sleep is essential for adequate functioning during the day. Sleep disorders, including insomnia, sleep apnea, and

narcolepsy, may make it hard for us to sleep well.

 Dreams occur primarily during REM sleep. Some theories of dreaming, such Freud’s, are based on the content of the

dreams. Other theories of dreaming propose that dreaming is related to memory consolidation. The activation-

synthesis theory of dreaming is based only on neural activity.

E X E R C I S E S A N D C R I T I C A L T H I N K I N G

1. If you happen to be home alone one night, try this exercise: At nightfall, leave the lights and any other powered

equipment off. Does this influence what time you go to sleep as opposed to your normal sleep time?

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2. Review your own sleep patterns. Are you getting enough sleep? What makes you think so?

3. Review some of the dreams that you have had recently. Consider how each of the theories of dreaming we have

discussed would explain your dreams.

[1] McGinniss, P. (2007). Seasonal affective disorder (SAD)—Treatment and drugs. Mayo Clinic. Retrieved

from http://www.mayoclinic.com/health/seasonal-affective-disorder/DS00195/DSECTION=treatments%2Dand%2Ddrugs

[2] Bodenhausen, G. V. (1990). Stereotypes as judgmental heuristics: Evidence of circadian variations in

discrimination. Psychological Science, 1, 319–322.

[3] Hobson, A. (2004). A model for madness? Dream consciousness: Our understanding of the neurobiology of sleep offers

insight into abnormalities in the waking brain. Nature, 430, 69–95.

[4] Dement, W., & Kleitman, N. (1957). Cyclic variations in EEG during sleep.Electroencephalography & Clinical Neurophysiology,

9, 673–690.

[5] National Sleep Foundation. (2009). Sleep in America Poll. Washington, DC: Author. Retrieved

fromhttp://www.sleepfoundation.org/sites/default/files/2009%20Sleep%20in%20America%20SOF%20EMBARGOED.pdf

[6] Morgenthaler, T. I., Kagramanov, V., Hanak, V., & Decker, P. A. (2006). Complex sleep apnea syndrome: Is it a unique clinical

syndrome? Sleep, 29(9), 1203–1209. Retrieved from http://www.journalsleep.org/ViewAbstract.aspx?pid=26630

[7] Yaggi, H. K., Concato, J., Kernan, W. N., Lichtman, J. H., Brass, L. M., & Mohsenin, V. (2005). Obstructive sleep apnea as a risk

factor for stroke and death. The New England Journal of Medicine, 353(19), 2034–2041. doi:10.1056/NEJMoa043104

[8] National Heart, Lung, and Blood Institute. (2008). Who is at risk for narcolepsy? Retrieved

from http://www.nhlbi.nih.gov/health/dci/Diseases/nar/nar_who.html

[9] Taheri, S., Zeitzer, J. M., & Mignot, E. (2002). The role of hypocretins (Orexins) in sleep regulation and narcolepsy. Annual

Review of Neuroscience, 25, 283–313.

[10] Mahowald, M., & Schenck, C. (2000). REM sleep parasomnias. Principles and Practice of Sleep Medicine, 724–741.

[11] Mahowald, M., & Schenck, C. (2000). REM sleep parasomnias. Principles and Practice of Sleep Medicine, 724–741.

[12] Mahowald, M., & Schenck, C. (2000). REM sleep parasomnias. Principles and Practice of Sleep Medicine, 724–741.

[13] Mahowald, M., & Schenck, C. (2005). REM sleep behavior disorder. Handbook of Clinical Neurophysiology, 6, 245–253.

[14] Mercer, P., Merritt, S., & Cowell, J. (1998). Differences in reported sleep need among adolescents. Journal of Adolescent

Health, 23(5), 259–263; National Sleep Foundation. (2008). Sleep in America Poll. Washington, DC: Author. Retrieved

fromhttp://www.sleepfoundation.org/sites/default/files/2008%20POLL%20SOF.PDF

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[15] Hack, M. A., Choi, S. J., Vijayapalan, P., Davies, R. J. O., & Stradling, J. R. S. (2001). Comparison of the effects of sleep

deprivation, alcohol and obstructive sleep apnoea (OSA) on simulated steering performance. Respiratory medicine, 95(7), 594–

601; Williamson, A., & Feyer, A. (2000). Moderate sleep deprivation produces impairments in cognitive and motor performance

equivalent to legally prescribed levels of alcohol intoxication. Occupational and Environmental Medicine, 57(10), 649.

[16] Smith-Coggins, R., Rosekind, M. R., Hurd, S., & Buccino, K. R. (1994). Relationship of day versus night sleep to physician

performance and mood. Annals of Emergency Medicine, 24(5), 928–934.

[17] Ferrie, J. E., Shipley, M. J., Cappuccio, F. P., Brunner, E., Miller, M. A., Kumari, M., & Marmot, M. G. (2007). A prospective

study of change in sleep duration: Associations with mortality in the Whitehall II cohort. Sleep, 30(12), 1659; Kushida, C.

(2005). Sleep deprivation: basic science, physiology, and behavior. London, England: Informa Healthcare.

[18] Dew, M. A., Hoch, C. C., Buysse, D. J., Monk, T. H., Begley, A. E., Houck, P. R.,…Reynolds, C. F., III. (2003). Healthy older

adults’ sleep predicts all-cause mortality at 4 to 19 years of follow-up. Psychosomatic Medicine, 65(1), 63–73.

[19] Dement, W. (1997) What all undergraduates should know about how their sleeping lives affect their waking lives. Sleepless

at Stanford. Retrieved fromhttp://www.Stanford.edu/~dement/sleepless.html

[20] Cartwright, R., Agargun, M., Kirkby, J., & Friedman, J. (2006). Relation of dreams to waking concerns. Psychiatry Research,

141(3), 261–270; Domhoff, G. W., Meyer-Gomes, K., & Schredl, M. (2005). Dreams as the expression of conceptions and

concerns: A comparison of German and American college students. Imagination, Cognition and Personality, 25(3), 269–282.

[21] Freud, S., & Classics of Medicine Library. (1988). The interpretation of dreams (Special ed.). Birmingham, AL: The Classics of

Medicine Library. (Original work published 1913)

[22] Alvarenga, T. A., Patti, C. L., Andersen, M. L., Silva, R. H., Calzavara, M. B., Lopez, G.B.,…Tufik, S. (2008). Paradoxical sleep

deprivation impairs acquisition, consolidation and retrieval of a discriminative avoidance task in rats. Neurobiology of Learning

and Memory, 90, 624–632; Zhang, J. (2004). Memory process and the function of sleep. Journal of Theoretics, 6(6), 1–7.

[23] Rauchs, G., Desgranges, B., Foret, J., & Eustache, F. (2005). The relationships between memory systems and sleep

stages. Journal of Sleep Research, 14, 123–140.

[24] Payne, J., & Nadel, L. (2004). Sleep, dreams, and memory consolidation: The role of the stress hormone cortisol. Learning &

Memory, 11(6), 671.

[25] Hobson, J. A., Pace-Schott, E. F., & Stickgold, R. (2000). Dreaming and the brain: Toward a cognitive neuroscience of

conscious states. Behavioral and Brain Sciences, 23(6), 793–842, 904–1018, 1083–1121.

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[26] Hobson, J. A., & McCarley, R. (1977). The brain as a dream state generator: An activation-synthesis hypothesis of the dream

process. American Journal of Psychiatry, 134, 1335–1348; Hobson, J. A. (2004). Dreams Freud never had: A new mind

science. New York, NY: Pi Press.

5.2 Altering Consciousness With Psychoactive Drugs L E A R N I N G O B J E C T I V E S

1. Summarize the major psychoactive drugs and their influences on consciousness and behavior.

2. Review the evidence regarding the dangers of recreational drugs.

A psychoactive drug is a chemical that changes our states of consciousness, and particularly our

perceptions and moods. These drugs are commonly found in everyday foods and beverages,

including chocolate, coffee, and soft drinks, as well as in alcohol and in over-the-counter drugs,

such as aspirin, Tylenol, and cold and cough medication. Psychoactive drugs are also frequently

prescribed as sleeping pills, tranquilizers, and antianxiety medications, and they may be taken,

illegally, for recreational purposes. As you can see in Table 5.1 “Psychoactive Drugs by Class”,

the four primary classes of psychoactive drugs are stimulants, depressants, opioids,

and hallucinogens.

Psychoactive drugs affect consciousness by influencing how neurotransmitters operate at the

synapses of the central nervous system (CNS). Some psychoactive drugs are agonists, which

mimic the operation of a neurotransmitter; some are antagonists, which block the action of a

neurotransmitter; and some work by blocking the reuptake of neurotransmitters at the synapse.

Table 5.1 Psychoactive Drugs by Class

Mechanism Symptoms Drug

Dangers and side

effects

Psychological

dependence

Physical

dependence

Addiction

potential

Addiction

potential

Stimulants

Stimulants block the

reuptake of dopamine,

norepinephrine, and

serotonin in the

synapses of the CNS.

Enhanced mood

and increased

energy

Caffeine

May create

dependence Low Low Low

Nicotine

Has major

negative health

effects if smoked High High High

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Mechanism Symptoms Drug

Dangers and side

effects

Psychological

dependence

Physical

dependence

Addiction

potential

Addiction

potential

or chewed

Cocaine

Decreased

appetite, headache Low Low Moderate

Amphetamines

Possible

dependence,

accompanied by

severe ―crash‖

with depression as

drug effects wear

off, particularly if

smoked or injected Moderate Low

Moderate

to high

Depressants

Depressants change

consciousness by

increasing the

production of the

neurotransmitter GABA

and decreasing the

production of the

neurotransmitter

acetylcholine, usually at

the level of the thalamus

and the reticular

formation.

Calming effects,

sleep, pain relief,

slowed heart rate

and respiration

Alcohol

Impaired

judgment, loss of

coordination,

dizziness, nausea,

and eventually a

loss of

consciousness Moderate Moderate Moderate

Barbiturates and

benzodiazepines

Sluggishness,

slowed speech,

drowsiness, in

severe cases, coma

or death Moderate Moderate Moderate

Toxic inhalants

Brain damage and

death High High High

Opioids

The chemical makeup of

opioids is similar to the

endorphins, the

neurotransmitters that

serve as the body’s

―natural pain reducers.‖

Slowing of many

body functions,

constipation,

respiratory and

cardiac

depression, and

the rapid

development of

tolerance

Opium

Side effects

include nausea,

vomiting,

tolerance, and

addiction. Moderate Moderate Moderate

Morphine

Restlessness,

irritability,

headache and body

aches, tremors, High Moderate Moderate

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Mechanism Symptoms Drug

Dangers and side

effects

Psychological

dependence

Physical

dependence

Addiction

potential

Addiction

potential

nausea, vomiting,

and severe

abdominal pain

Heroin

All side effects of

morphine but

about twice as

addictive as

morphine High Moderate High

Hallucinogens

The chemical

compositions of the

hallucinogens are

similar to the

neurotransmitters

serotonin and

epinephrine, and they

act primarily by

mimicking them.

Altered

consciousness;

hallucinations

Marijuana

Mild intoxication;

enhanced

perception Low Low Low

LSD, mescaline,

PCP, and peyote

Hallucinations;

enhanced

perception Low Low Low

In some cases the effects of psychoactive drugs mimic other naturally occurring states of

consciousness. For instance, sleeping pills are prescribed to create drowsiness, and

benzodiazepines are prescribed to create a state of relaxation. In other cases psychoactive drugs

are taken for recreational purposes with the goal of creating states of consciousness that are

pleasurable or that help us escape our normal consciousness.

The use of psychoactive drugs, and especially those that are used illegally, has the potential to

create very negative side effects (Table 5.1 “Psychoactive Drugs by Class”). This does not mean

that all drugs are dangerous, but rather that all drugs can be dangerous, particularly if they are

used regularly over long periods of time. Psychoactive drugs create negative effects not so much

through their initial use but through the continued use, accompanied by increasing doses, that

ultimately may lead to drug abuse.

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The problem is that many drugs create tolerance: an increase in the dose required to produce the

same effect, which makes it necessary for the user to increase the dosage or the number of times

per day that the drug is taken. As the use of the drug increases, the user may develop

a dependence, defined as a need to use a drug or other substance regularly. Dependence can be

psychological, in which the drug is desired and has become part of the everyday life of the user,

but no serious physical effects result if the drug is not obtained; or physical, in which serious

physical and mental effects appear when the drug is withdrawn. Cigarette smokers who try to

quit, for example, experience physical withdrawal symptoms, such as becoming tired and

irritable, as well as extreme psychological cravings to enjoy a cigarette in particular situations,

such as after a meal or when they are with friends.

Users may wish to stop using the drug, but when they reduce their dosage they

experience withdrawal—negative experiences that accompany reducing or stopping drug use,

including physical pain and other symptoms. When the user powerfully craves the drug and is

driven to seek it out, over and over again, no matter what the physical, social, financial, and

legal cost, we say that he or she has developed an addiction to the drug.

It is a common belief that addiction is an overwhelming, irresistibly powerful force, and that

withdrawal from drugs is always an unbearably painful experience. But the reality is more

complicated and in many cases less extreme. For one, even drugs that we do not generally think

of as being addictive, such as caffeine, nicotine, and alcohol, can be very difficult to quit using,

at least for some people. On the other hand, drugs that are normally associated with addiction,

including amphetamines, cocaine, and heroin, do not immediately create addiction in their users.

Even for a highly addictive drug like cocaine, only about 15% of users become addicted

(Robinson & Berridge, 2003; Wagner & Anthony, 2002). [1]

Furthermore, the rate of addiction is

lower for those who are taking drugs for medical reasons than for those who are using drugs

recreationally. Patients who have become physically dependent on morphine administered during

the course of medical treatment for a painful injury or disease are able to be rapidly weaned off

the drug afterward, without becoming addicts. Robins, Davis, and Goodwin (1974) [2]

found that

the majority of soldiers who had become addicted to morphine while overseas were quickly able

to stop using after returning home.

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This does not mean that using recreational drugs is not dangerous. For people who do become

addicted to drugs, the success rate of recovery is low. These drugs are generally illegal and carry

with them potential criminal consequences if one is caught and arrested. Drugs that are smoked

may produce throat and lung cancers and other problems. Snorting (―sniffing‖) drugs can lead to

a loss of the sense of smell, nosebleeds, difficulty in swallowing, hoarseness, and chronic runny

nose. Injecting drugs intravenously carries with it the risk of contracting infections such as

hepatitis and HIV. Furthermore, the quality and contents of illegal drugs are generally unknown,

and the doses can vary substantially from purchase to purchase. The drugs may also contain toxic

chemicals.

Another problem is the unintended consequences of combining drugs, which can produce serious

side effects. Combining drugs is dangerous because their combined effects on the CNS can

increase dramatically and can lead to accidental or even deliberate overdoses. For instance,

ingesting alcohol or benzodiazepines along with the usual dose of heroin is a frequent cause of

overdose deaths in opiate addicts, and combining alcohol and cocaine can have a dangerous

impact on the cardiovascular system (McCance-Katz, Kosten, & Jatlow, 1998). [3]

Although all recreational drugs are dangerous, some can be more deadly than others. One way to

determine how dangerous recreational drugs are is to calculate a safety ratio, based on the dose

that is likely to be fatal divided by the normal dose needed to feel the effects of the drug. Drugs

with lower ratios are more dangerous because the difference between the normal and the lethal

dose is small. For instance, heroin has a safety ratio of 6 because the average fatal dose is only 6

times greater than the average effective dose. On the other hand, marijuana has a safety ratio of

1,000. This is not to say that smoking marijuana cannot be deadly, but it is much less likely to be

deadly than is heroin. The safety ratios of common recreational drugs are shown in Table 5.2

“Popular Recreational Drugs and Their Safety Ratios”.

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Table 5.2 Popular Recreational Drugs and Their Safety Ratios

Drug Description Street or brand names

Safety

ratio

Heroin Strong depressant Smack, junk, H 6

GHB (Gamma hydroxy

butyrate)

―Rave‖ drug (not Ecstacy), also

used as a ―date rape‖ drug.

Georgia home boy, liquid ecstasy, liquid

X, liquid G, fantasy 8

Isobutyl nitrite Depressant and toxic inhalant Poppers, rush, locker room 8

Alcohol Active compound is ethanol

10

DXM (Dextromethorphan)

Active ingredient in over-the-

counter cold and cough medicines

10

Methamphetamine May be injected or smoked Meth, crank 10

Cocaine May be inhaled or smoked Crack, coke, rock, blue 15

MDMA (methylene-

dioxymethamphetamine) Very powerful stimulant Ecstasy 16

Codeine Depressant

20

Methadone Opioid

20

Mescaline Hallucinogen

24

Benzodiazepine Prescription tranquilizer

Centrax, Dalmane, Doral, Halcion,

Librium, ProSom, Restoril, Xanax,

Valium 30

Ketamine Prescription anesthetic Ketanest, Ketaset, Ketalar 40

DMT (Dimethyltryptamine) Hallucinogen

50

Phenobarbital

Usually prescribed as a sleeping

pill

Luminal (Phenobarbital), Mebaraland,

Nembutal, Seconal, Sombulex 50

Prozac Antidepressant

100

Nitrous oxide

Often inhaled from whipped cream

dispensers Laughing gas 150

Lysergic acid diethylamide

(LSD)

Acid 1,000

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Drug Description Street or brand names

Safety

ratio

Marijuana (Cannabis) Active ingredient is THC Pot, spliff, weed 1,000

Drugs with lower safety ratios have a greater risk of brain damage and death.

Source: Gable, R. (2004). Comparison of acute lethal toxicity of commonly abused psychoactive substances. Addiction, 99(6),

686–696.

Speeding Up the Brain With Stimulants: Caffeine, Nicotine, Cocaine, and

Amphetamines

A stimulant is a psychoactive drug that operates by blocking the reuptake of dopamine,

norepinephrine, and serotonin in the synapses of the CNS. Because more of these

neurotransmitters remain active in the brain, the result is an increase in the activity of the

sympathetic division of the autonomic nervous system (ANS). Effects of stimulants include

increased heart and breathing rates, pupil dilation, and increases in blood sugar accompanied by

decreases in appetite. For these reasons, stimulants are frequently used to help people stay awake

and to control weight.

Used in moderation, some stimulants may increase alertness, but used in an irresponsible fashion

they can quickly create dependency. A major problem is the ―crash‖ that results when the drug

loses its effectiveness and the activity of the neurotransmitters returns to normal. The withdrawal

from stimulants can create profound depression and lead to an intense desire to repeat the high.

Caffeine is a bitter psychoactive drug found in the beans, leaves, and fruits of plants, where it

acts as a natural pesticide. It is found in a wide variety of products, including coffee, tea, soft

drinks, candy, and desserts. In North America, more than 80% of adults consume caffeine daily

(Lovett, 2005). [4]

Caffeine acts as a mood enhancer and provides energy. Although the U.S. Food

and Drug Administration lists caffeine as a safe food substance, it has at least some

characteristics of dependence. People who reduce their caffeine intake often report being

irritable, restless, and drowsy, as well as experiencing strong headaches, and these withdrawal

symptoms may last up to a week. Most experts feel that using small amounts of caffeine during

pregnancy is safe, but larger amounts of caffeine can be harmful to the fetus (U.S. Food and

Drug Administration, 2007). [5]

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Nicotine is a psychoactive drug found in the nightshade family of plants, where it acts as a

natural pesticide. Nicotine is the main cause for the dependence-forming properties of tobacco

use, and tobacco use is a major health threat. Nicotine creates both psychological and physical

addiction, and it is one of the hardest addictions to break. Nicotine content in cigarettes has

slowly increased over the years, making quitting smoking more and more difficult. Nicotine is

also found in smokeless (chewing) tobacco.

People who want to quit smoking sometimes use other drugs to help them. For instance, the

prescription drug Chantix acts as an antagonist, binding to nicotine receptors in the synapse,

which prevents users from receiving the normal stimulant effect when they smoke. At the same

time, the drug also releases dopamine, the reward neurotransmitter. In this way Chantix dampens

nicotine withdrawal symptoms and cravings. In many cases people are able to get past the

physical dependence, allowing them to quit smoking at least temporarily. In the long run,

however, the psychological enjoyment of smoking may lead to relapse.

Cocaine is an addictive drug obtained from the leaves of the coca plant. In the late 19th and

early 20th centuries, it was a primary constituent in many popular tonics and elixirs and,

although it was removed in 1905, was one of the original ingredients in Coca-Cola. Today

cocaine is taken illegally as recreational drug.

Cocaine has a variety of adverse effects on the body. It constricts blood vessels, dilates pupils,

and increases body temperature, heart rate, and blood pressure. It can cause headaches,

abdominal pain, and nausea. Since cocaine also tends to decrease appetite, chronic users may

also become malnourished. The intensity and duration of cocaine’s effects, which include

increased energy and reduced fatigue, depend on how the drug is taken. The faster the drug is

absorbed into the bloodstream and delivered to the brain, the more intense the high. Injecting or

smoking cocaine produces a faster, stronger high than snorting it. However, the faster the drug is

absorbed, the faster the effects subside. The high from snorting cocaine may last 30 minutes,

whereas the high from smoking ―crack‖ cocaine may last only 10 minutes. In order to sustain the

high, the user must administer the drug again, which may lead to frequent use, often in higher

doses, over a short period of time (National Institute on Drug Abuse, 2009). [6]

Cocaine has a

safety ratio of 15, making it a very dangerous recreational drug.

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Amphetamine is a stimulant that produces increased wakefulness and focus, along with

decreased fatigue and appetite. Amphetamine is used in prescription medications to treat

attention deficit disorder (ADD) and narcolepsy, and to control appetite. Some brand names of

amphetamines are Adderall, Benzedrine, Dexedrine, and Vyvanse. But amphetamine (―speed‖) is

also used illegally as a recreational drug. The methylated version of

amphetamine, methamphetamine (―meth‖ or ―crank‖), is currently favored by users, partly

because it is available in ampoules ready for use by injection (Csaky & Barnes, 1984). [7]

Meth is

a highly dangerous drug with a safety ratio of only 10.

Amphetamines may produce a very high level of tolerance, leading users to increase their intake,

often in ―jolts‖ taken every half hour or so. Although the level of physical dependency is small,

amphetamines may produce very strong psychological dependence, effectively amounting to

addiction. Continued use of stimulants may result in severe psychological depression. The effects

of the stimulant methylenedioxymethamphetamine (MDMA), also known as ―Ecstasy,‖ provide

a good example. MDMA is a very strong stimulant that very successfully prevents the reuptake

of serotonin, dopamine, and norepinephrine. It is so effective that when used repeatedly it can

seriously deplete the amount of neurotransmitters available in the brain, producing a catastrophic

mental and physical ―crash‖ resulting in serious, long-lasting depression. MDMA also affects the

temperature-regulating mechanisms of the brain, so in high doses, and especially when combined

with vigorous physical activity like dancing, it can cause the body to become so drastically

overheated that users can literally ―burn up‖ and die from hyperthermia and dehydration.

Slowing Down the Brain With Depressants: Alcohol, Barbiturates and

Benzodiazepines, and Toxic Inhalants

In contrast to stimulants, which work to increase neural activity, a depressantacts to slow down

consciousness. A depressant is a psychoactive drug that reduces the activity of the CNS.

Depressants are widely used as prescription medicines to relieve pain, to lower heart rate and

respiration, and as anticonvulsants. Depressants change consciousness by increasing the

production of the neurotransmitter GABA and decreasing the production of the neurotransmitter

acetylcholine, usually at the level of the thalamus and the reticular formation. The outcome of

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depressant use (similar to the effects of sleep) is a reduction in the transmission of impulses from

the lower brain to the cortex (Csaky & Barnes, 1984). [8]

The most commonly used of the depressants is alcohol, a colorless liquid, produced by the

fermentation of sugar or starch, that is the intoxicating agent in fermented drinks. Alcohol is the

oldest and most widely used drug of abuse in the world. In low to moderate doses, alcohol first

acts to remove social inhibitions by slowing activity in the sympathetic nervous system. In

higher doses, alcohol acts on the cerebellum to interfere with coordination and balance,

producing the staggering gait of drunkenness. At high blood levels, further CNS depression leads

to dizziness, nausea, and eventually a loss of consciousness. High enough blood levels such as

those produced by ―guzzling‖ large amounts of hard liquor at parties can be fatal. Alcohol is not

a ―safe‖ drug by any means—its safety ratio is only 10.

Alcohol use is highly costly to societies because so many people abuse alcohol and because

judgment after drinking can be substantially impaired. It is estimated that almost half of

automobile fatalities are caused by alcohol use, and excessive alcohol consumption is involved in

a majority of violent crimes, including rape and murder (Abbey, Ross, McDuffie, & McAuslan,

1996). [9]

Alcohol increases the likelihood that people will respond aggressively to provocations

(Bushman, 1993, 1997; Graham, Osgood, Wells, & Stockwell, 2006). [10]

Even people who are

not normally aggressive may react with aggression when they are intoxicated. Alcohol use also

leads to rioting, unprotected sex, and other negative outcomes.

Alcohol increases aggression in part because it reduces the ability of the person who has

consumed it to inhibit his or her aggression (Steele & Southwick, 1985). [11]

When people are

intoxicated, they become more self-focused and less aware of the social situation. As a result,

they become less likely to notice the social constraints that normally prevent them from engaging

aggressively, and are less likely to use those social constraints to guide them. For instance, we

might normally notice the presence of a police officer or other people around us, which would

remind us that being aggressive is not appropriate. But when we are drunk, we are less likely to

be so aware. The narrowing of attention that occurs when we are intoxicated also prevents us

from being cognizant of the negative outcomes of our aggression. When we are sober, we realize

that being aggressive may produce retaliation, as well as cause a host of other problems, but we

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are less likely to realize these potential consequences when we have been drinking (Bushman &

Cooper, 1990). [12]

Alcohol also influences aggression through expectations. If we expect that

alcohol will make us more aggressive, then we tend to become more aggressive when we drink.

Barbiturates are depressants that are commonly prescribed as sleeping pills and painkillers.

Brand names include Luminal (Phenobarbital), Mebaraland, Nembutal, Seconal, and Sombulex.

In small to moderate doses, barbiturates produce relaxation and sleepiness, but in higher doses

symptoms may include sluggishness, difficulty in thinking, slowness of speech, drowsiness,

faulty judgment, and eventually coma or even death (Medline Plus, 2008). [13]

Related to barbiturates, benzodiazepines are a family of depressants used to treat anxiety,

insomnia, seizures, and muscle spasms. In low doses, they produce mild sedation and relieve

anxiety; in high doses, they induce sleep. In the United States, benzodiazepines are among the

most widely prescribed medications that affect the CNS. Brand names include Centrax,

Dalmane, Doral, Halcion, Librium, ProSom, Restoril, Xanax, and Valium.

Toxic inhalants are also frequently abused as depressants. These drugs are easily accessible as

the vapors of glue, gasoline, propane, hair spray, and spray paint, and are inhaled to create a

change in consciousness. Related drugs are the nitrites (amyl and butyl nitrite; ―poppers,‖ ―rush,‖

―locker room‖) and anesthetics such as nitrous oxide (laughing gas) and ether. Inhalants are

some of the most dangerous recreational drugs, with a safety index below 10, and their continued

use may lead to permanent brain damage.

Opioids: Opium, Morphine, Heroin, and Codeine

Opioids are chemicals that increase activity in opioid receptor neurons in the brain and in the

digestive system, producing euphoria, analgesia, slower breathing, and constipation. Their

chemical makeup is similar to the endorphins, the neurotransmitters that serve as the body’s

―natural pain reducers.‖ Natural opioids are derived from the opium poppy, which is widespread

in Eurasia, but they can also be created synthetically.

Opium is the dried juice of the unripe seed capsule of the opium poppy. It may be the oldest drug

on record, known to the Sumerians before 4000 BC.Morphine and heroin are stronger, more

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addictive drugs derived from opium, while codeine is a weaker analgesic and less addictive

member of the opiate family. When morphine was first refined from opium in the early 19th

century, it was touted as a cure for opium addiction, but it didn’t take long to discover that it was

actually more addicting than raw opium. When heroin was produced a few decades later, it was

also initially thought to be a more potent, less addictive painkiller but was soon found to be much

more addictive than morphine. Heroin is about twice as addictive as morphine, and creates

severe tolerance, moderate physical dependence, and severe psychological dependence. The

danger of heroin is demonstrated in the fact that it has the lowest safety ratio (6) of all the drugs

listed in Table 5.1 “Psychoactive Drugs by Class”.

The opioids activate the sympathetic division of the ANS, causing blood pressure and heart rate

to increase, often to dangerous levels that can lead to heart attack or stroke. At the same time the

drugs also influence the parasympathetic division, leading to constipation and other negative side

effects. Symptoms of opioid withdrawal include diarrhea, insomnia, restlessness, irritability, and

vomiting, all accompanied by a strong craving for the drug. The powerful psychological

dependence of the opioids and the severe effects of withdrawal make it very difficult for

morphine and heroin abusers to quit using. In addition, because many users take these drugs

intravenously and share contaminated needles, they run a very high risk of being infected with

diseases. Opioid addicts suffer a high rate of infections such as HIV, pericarditis (an infection of

the membrane around the heart), and hepatitis B, any of which can be fatal.

Hallucinogens: Cannabis, Mescaline, and LSD

The drugs that produce the most extreme alteration of consciousness are

the hallucinogens,psychoactive drugs that alter sensation and perception and that may create

hallucinations. The hallucinogens are frequently known as ―psychedelics.‖ Drugs in this class

include lysergic acid diethylamide (LSD, or ―Acid‖), mescaline, and phencyclidine (PCP), as

well as a number of natural plants including cannabis (marijuana), peyote, and psilocybin. The

chemical compositions of the hallucinogens are similar to the neurotransmitters serotonin and

epinephrine, and they act primarily as agonists by mimicking the action of serotonin at the

synapses. The hallucinogens may produce striking changes in perception through one or more of

the senses. The precise effects a user experiences are a function not only of the drug itself, but

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also of the user’s preexisting mental state and expectations of the drug experience. In large part,

the user tends to get out of the experience what he or she brings to it.The hallucinations that may

be experienced when taking these drugs are strikingly different from everyday experience and

frequently are more similar to dreams than to everyday consciousness.

Cannabis (marijuana) is the most widely used hallucinogen. Until it was banned in the United

States under the Marijuana Tax Act of 1938, it was widely used for medical purposes. In recent

years, cannabis has again been frequently prescribed for the treatment of pain and nausea,

particularly in cancer sufferers, as well as for a wide variety of other physical and psychological

disorders (Ben Amar, 2006). [14]

While medical marijuana is now legal in several American

states, it is still banned under federal law, putting those states in conflict with the federal

government. Marijuana also acts as a stimulant, producing giggling, laughing, and mild

intoxication. It acts to enhance perception of sights, sounds, and smells, and may produce a

sensation of time slowing down. It is much less likely to lead to antisocial acts than that other

popular intoxicant, alcohol, and it is also the one psychedelic drug whose use has not declined in

recent years (National Institute on Drug Abuse, 2009). [15]

Although the hallucinogens are powerful drugs that produce striking ―mind-altering‖ effects,

they do not produce physiological or psychological tolerance or dependence. While they are not

addictive and pose little physical threat to the body, their use is not advisable in any situation in

which the user needs to be alert and attentive, exercise focused awareness or good judgment, or

demonstrate normal mental functioning, such as driving a car, studying, or operating machinery.

Why We Use Psychoactive Drugs

People have used, and often abused, psychoactive drugs for thousands of years. Perhaps this

should not be surprising, because many people find using drugs to be fun and enjoyable. Even

when we know the potential costs of using drugs, we may engage in them anyway because the

pleasures of using the drugs are occurring right now, whereas the potential costs are abstract and

occur in the future.

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Research Focus: Risk Tolerance Predicts Cigarette Use

Because drug and alcohol abuse is a behavior that has such important negative consequences for so many people,

researchers have tried to understand what leads people to use drugs. Carl Lejuez and his colleagues (Lejuez, Aklin,

Bornovalova, & Moolchan, 2005) [16]

tested the hypothesis that cigarette smoking was related to a desire to take risks.

In their research they compared risk-taking behavior in adolescents who reported having tried a cigarette at least

once with those who reported that they had never tried smoking.

Participants in the research were 125 5th- through 12th-graders attending after-school programs throughout inner-

city neighborhoods in the Washington, DC, metropolitan area. Eighty percent of the adolescents indicated that they

had never tried even a puff of a cigarette, and 20% indicated that they had had at least one puff of a cigarette.

The participants were tested in a laboratory where they completed the Balloon Analogue Risk Task (BART), a

measure of risk taking (Lejuez et al., 2002). [17]

The BART is a computer task in which the participant pumps up a

series of simulated balloons by pressing on a computer key. With each pump the balloon appears bigger on the screen,

and more money accumulates in a temporary “bank account.” However, when a balloon is pumped up too far, the

computer generates a popping sound, the balloon disappears from the screen, and all the money in the temporary

bank is lost. At any point during each balloon trial, the participant can stop pumping up the balloon, click on a button,

transfer all money from the temporary bank to the permanent bank, and begin with a new balloon.

Because the participants do not have precise information about the probability of each balloon exploding, and

because each balloon is programmed to explode after a different number of pumps, the participants have to

determine how much to pump up the balloon. The number of pumps that participants take is used as a measure of

their tolerance for risk. Low-tolerance people tend to make a few pumps and then collect the money, whereas more

risky people pump more times into each balloon.

Supporting the hypothesis that risk tolerance is related to smoking, Lejuez et al. found that the tendency to take risks

was indeed correlated with cigarette use: The participants who indicated that they had puffed on a cigarette had

significantly higher risk-taking scores on the BART than did those who had never tried smoking.

Individual ambitions, expectations, and values also influence drug use. Vaughan, Corbin, and

Fromme (2009) [18]

found that college students who expressed positive academic values and

strong ambitions had less alcohol consumption and alcohol-related problems, and cigarette

smoking has declined more among youth from wealthier and more educated homes than among

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those from lower socioeconomic backgrounds (Johnston, O’Malley, Bachman, & Schulenberg,

2004). [19]

Drug use is in part the result of socialization. Children try drugs when their friends convince

them to do it, and these decisions are based on social norms about the risks and benefits of

various drugs. In the period 1991 to 1997, the percentage of 12th-graders who responded that

they perceived ―great harm in regular marijuana use‖ declined from 79% to 58%, while annual

use of marijuana in this group rose from 24% to 39% (Johnston et al., 2004). [20]

And students

binge drink in part when they see that many other people around them are also binging (Clapp,

Reed, Holmes, Lange, & Voas, 2006). [21]

Figure 5.13 Use of Various Drugs by 12th-Graders in 2005

Despite the fact that young people have experimented with cigarettes, alcohol, and other

dangerous drugs for many generations, it would be better if they did not. All recreational drug

use is associated with at least some risks, and those who begin using drugs earlier are also more

likely to use more dangerous drugs later (Lynskey et al., 2003). [22]

Furthermore, as we will see

in the next section, there are many other enjoyable ways to alter consciousness that are safer.

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K E Y T A K E A W A Y S

 Psychoactive drugs are chemicals that change our state of consciousness. They work by influencing neurotransmitters

in the CNS.

 Using psychoactive drugs may create tolerance and, when they are no longer used, withdrawal. Addiction may result

from tolerance and the difficulty of withdrawal.

 Stimulants, including caffeine, nicotine, and amphetamine, increase neural activity by blocking the reuptake of

dopamine, norepinephrine, and serotonin in the CNS.

 Depressants, including, alcohol, barbiturates, and benzodiazepines, decrease consciousness by increasing the

production of the neurotransmitter GABA and decreasing the production of the neurotransmitter acetylcholine.

 Opioids, including codeine, opium, morphine and heroin, produce euphoria and analgesia by increasing activity in

opioid receptor neurons.

 Hallucinogens, including cannabis, mescaline, and LSD, create an extreme alteration of consciousness as well as the

possibility of hallucinations.

 Recreational drug use is influenced by social norms as well as by individual differences. People who are more likely to

take risks are also more likely to use drugs.

E X E R C I S E S A N D C R I T I C A L T H I N K I N G

1. Do people you know use psychoactive drugs? Which ones? Based on what you have learned in this section, why do

you think that they are used, and do you think that their side effects are harmful?

2. Consider the research reported in the research focus on risk and cigarette smoking. What are the potential

implications of the research for drug use? Can you see any weaknesses in the study caused by the fact that the results

are based on correlational analyses?

[1] Robinson, T. E., & Berridge, K. C. (2003). Addiction. Annual Review of Psychology, 54, 25–53; Wagner, F. A., & Anthony, J. C.

(2002). From first drug use to drug dependence: Developmental periods of risk for dependence upon marijuana, cocaine, and

alcohol.Neuropsychopharmacology, 26(4), 479–488.

[2] Robins, L. N., Davis, D. H., & Goodwin, D. W. (1974). Drug use by U.S. Army enlisted men in Vietnam: A follow-up on their

return home. American Journal of Epidemiology, 99, 235–249.

[3] McCance-Katz, E., Kosten, T., & Jatlow, P. (1998). Concurrent use of cocaine and alcohol is more potent and potentially more

toxic than use of either alone—A multiple-dose study 1. Biological Psychiatry, 44(4), 250–259.

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[4] Lovett, R. (2005, September 24). Coffee: The demon drink? New Scientist, 2518. Retrieved

from http://www.newscientist.com/article.ns?id=mg18725181.700

[5] U.S. Food and Drug Administration. (2007). Medicines in my home: Caffeine and your body. Retrieved

fromhttp://www.fda.gov/downloads/Drugs/ResourcesForYou/Consumers/BuyingUsingMedicineSafely/UnderstandingOver-the-

CounterMedicines/UCM205286.pdf

[6] National Institute on Drug Abuse. (2009). Cocaine abuse and addiction. Retrieved

fromhttp://www.nida.nih.gov/researchreports/cocaine/cocaine.html

[7] Csaky, T. Z., & Barnes, B. A. (1984). Cutting’s handbook of pharmacology (7th ed.). East Norwalk, CT: Appleton-Century-

Crofts.

[8] Csaky, T. Z., & Barnes, B. A. (1984). Cutting’s handbook of pharmacology (7th ed.). East Norwalk, CT: Appleton-Century-

Crofts.

[9] Abbey, A., Ross, L. T., McDuffie, D., & McAuslan, P. (1996). Alcohol and dating risk factors for sexual assault among college

women. Psychology of Women Quarterly, 20(1), 147–169.

[10] Bushman, B. J. (1993). Human aggression while under the influence of alcohol and other drugs: An integrative research

review. Current Directions in Psychological Science, 2(5), 148–152; Bushman, B. J. (Ed.). (1997). Effects of alcohol on human

aggression: Validity of proposed explanations. New York, NY: Plenum Press; Graham, K., Osgood, D. W., Wells, S., & Stockwell,

T. (2006). To what extent is intoxication associated with aggression in bars? A multilevel analysis. Journal of Studies on Alcohol,

67(3), 382–390.

[11] Steele, C. M., & Southwick, L. (1985). Alcohol and social behavior: I. The psychology of drunken excess. Journal of

Personality and Social Psychology, 48(1), 18–34.

[12] Bushman, B. J., & Cooper, H. M. (1990). Effects of alcohol on human aggression: An integrative research

review. Psychological Bulletin, 107(3), 341–354.

[13] Medline Plus. (2008). Barbiturate intoxication and overdose. Retrieved

fromhttp://www.nlm.nih.gov/medlineplus/ency/article/000951.htm

[14] Ben Amar, M. (2006). Cannabinoids in medicine: A review of their therapeutic potential. Journal of Ethnopharmacology,

105, 1–25.

[15] National Institute on Drug Abuse. (2009). NIDA InfoFacts: High School and Youth Trends. Retrieved

from http://www.drugabuse.gov/infofacts/HSYouthTrends.html

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[16] Lejuez, C. W., Aklin, W. M., Bornovalova, M. A., & Moolchan, E. T. (2005). Differences in risk-taking propensity across inner-

city adolescent ever- and never-smokers. Nicotine & Tobacco Research, 7(1), 71–79.

[17] Lejuez, C. W., Read, J. P., Kahler, C. W., Richards, J. B., Ramsey, S. E., Stuart, G. L.,…Brown, R. A. (2002). Evaluation of a

behavioral measure of risk taking: The Balloon Analogue Risk Task (BART). Journal of Experimental Psychology: Applied, 8(2),

75–85.

[18] Vaughan, E. L., Corbin, W. R., & Fromme, K. (2009). Academic and social motives and drinking behavior. Psychology of

Addictive Behaviors. 23(4), 564–576.

[19] Johnston, L. D., O’Malley, P. M., Bachman, J. G., & Schulenberg, J. E. (2004). Monitoring the future: National results on

adolescent drug use. Ann Arbor, MI: Institute for Social Research, University of Michigan (conducted for the National Institute

on Drug Abuse, National Institute of Health).

[20] Johnston, L. D., O’Malley, P. M., Bachman, J. G., & Schulenberg, J. E. (2004). Monitoring the future: National results on

adolescent drug use. Ann Arbor, MI: Institute for Social Research, University of Michigan (conducted for the National Institute

on Drug Abuse, National Institute of Health).

[21] Clapp, J., Reed, M., Holmes, M., Lange, J., & Voas, R. (2006). Drunk in public, drunk in private: The relationship between

college students, drinking environments and alcohol consumption. The American Journal of Drug and Alcohol Abuse, 32(2),

275–285.

[22] Lynskey, M. T., Heath, A. C., Bucholz, K. K., Slutske, W. S., Madden, P. A. F., Nelson, E. C.,…Martin, N. G. (2003). Escalation

of drug use in early-onset cannabis users vs co-twin controls. Journal of the American Medical Association, 289(4), 427–433.

5.3 Altering Consciousness Without Drugs L E A R N I N G O B J E C T I V E

1. Review the ways that people may alter consciousness without using drugs.

Although the use of psychoactive drugs can easily and profoundly change our experience of

consciousness, we can also—and often more safely—alter our consciousness without drugs.

These altered states of consciousness are sometimes the result of simple and safe activities, such

as sleeping, watching television, exercising, or working on a task that intrigues us. In this section

we consider the changes in consciousness that occur through hypnosis, sensory deprivation,

and meditation, as well as through other non-drug-induced mechanisms.

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Changing Behavior Through Suggestion: The Power of Hypnosis

Franz Anton Mesmer (1734–1815) was an Austrian doctor who believed that all living bodies

were filled with magnetic energy. In his practice, Mesmer passed magnets over the bodies of his

patients while telling them their physical and psychological problems would disappear. The

patients frequently lapsed into a trancelike state (they were said to be ―mesmerized‖) and

reported feeling better when they awoke (Hammond, 2008). [1]

Although subsequent research testing the effectiveness of Mesmer’s techniques did not find any

long-lasting improvements in his patients, the idea that people’s experiences and behaviors could

be changed through the power of suggestion has remained important in psychology. James Braid,

a Scottish physician, coined the term hypnosis in 1843, basing it on the Greek word

for sleep(Callahan, 1997). [2]

Hypnosis is a trance-like state of consciousness, usually induced by a procedure known as

hypnotic induction, which consists of heightened suggestibility, deep relaxation, and intense

focus(Nash & Barnier, 2008). [3]

Hypnosis became famous in part through its use by Sigmund

Freud in an attempt to make unconscious desires and emotions conscious and thus able to be

considered and confronted (Baker & Nash, 2008). [4]

Because hypnosis is based on the power of suggestion, and because some people are more

suggestible than others, these people are more easily hypnotized. Hilgard (1965) [5]

found that

about 20% of the participants he tested were entirely unsusceptible to hypnosis, whereas about

15% were highly responsive to it. The best participants for hypnosis are people who are willing

or eager to be hypnotized, who are able to focus their attention and block out peripheral

awareness, who are open to new experiences, and who are capable of fantasy (Spiegel,

Greenleaf, & Spiegel, 2005). [6]

People who want to become hypnotized are motivated to be good subjects, to be open to

suggestions by the hypnotist, and to fulfill the role of a hypnotized person as they perceive it

(Spanos, 1991). [7]

The hypnotized state results from a combination of conformity, relaxation,

obedience, and suggestion (Fassler, Lynn, & Knox, 2008). [8]

This does not necessarily indicate

that hypnotized people are ―faking‖ or lying about being hypnotized. Kinnunen, Zamansky, and

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Block (1994) [9]

used measures of skin conductance (which indicates emotional response by

measuring perspiration, and therefore renders it a reliable indicator of deception) to test whether

hypnotized people were lying about having been hypnotized. Their results suggested that almost

90% of their supposedly hypnotized subjects truly believed that they had been hypnotized.

One common misconception about hypnosis is that the hypnotist is able to ―take control‖ of

hypnotized patients and thus can command them to engage in behaviors against their will.

Although hypnotized people are suggestible (Jamieson & Hasegawa, 2007), [10]

they nevertheless

retain awareness and control of their behavior and are able to refuse to comply with the

hypnotist’s suggestions if they so choose (Kirsch & Braffman, 2001). [11]

In fact, people who

have not been hypnotized are often just as suggestible as those who have been (Orne & Evans,

1965). [12]

Another common belief is that hypnotists can lead people to forget the things that happened to

them while they were hypnotized. Hilgard and Cooper (1965) [13]

investigated this question and

found that they could lead people who were very highly susceptible through hypnosis to show at

least some signs of posthypnotic amnesia (e.g., forgetting where they had learned information

that had been told to them while they were under hypnosis), but that this effect was not strong or

common.

Some hypnotists have tried to use hypnosis to help people remember events, such as childhood

experiences or details of crime scenes, that they have forgotten or repressed. The idea is that

some memories have been stored but can no longer be retrieved, and that hypnosis can aid in the

retrieval process. But research finds that this is not successful: People who are hypnotized and

then asked to relive their childhood act like children, but they do not accurately recall the things

that occurred to them in their own childhood (Silverman & Retzlaff, 1986). [14]

Furthermore, the

suggestibility produced through hypnosis may lead people to erroneously recall experiences that

they did not have (Newman & Baumeister, 1996). [15]

Many states and jurisdictions have

therefore banned the use of hypnosis in criminal trials because the ―evidence‖ recovered through

hypnosis is likely to be fabricated and inaccurate.

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Hypnosis is also frequently used to attempt to change unwanted behaviors, such as to reduce

smoking, overeating, and alcohol abuse. The effectiveness of hypnosis in these areas is

controversial, although at least some successes have been reported. Kirsch, Montgomery, and

Sapirstein (1995) [16]

found that that adding hypnosis to other forms of therapies increased the

effectiveness of the treatment, and Elkins and Perfect (2008) [17]

reported that hypnosis was

useful in helping people stop smoking. Hypnosis is also effective in improving the experiences

of patients who are experiencing anxiety disorders, such as PTSD (Cardena, 2000; Montgomery,

David, Winkel, Silverstein, & Bovbjerg, 2002), [18]

and for reducing pain (Montgomery,

DuHamel, & Redd, 2000; Paterson & Jensen, 2003). [19]

Reducing Sensation to Alter Consciousness: Sensory Deprivation

Sensory deprivation is the intentional reduction of stimuli affecting one or more of the five

senses, with the possibility of resulting changes in consciousness. Sensory deprivation is used for

relaxation or meditation purposes, and in physical and mental health-care programs to produce

enjoyable changes in consciousness. But when deprivation is prolonged, it is unpleasant and can

be used as a means of torture.

Although the simplest forms of sensory deprivation require nothing more than a blindfold to

block the person’s sense of sight or earmuffs to block the sense of sound, more complex devices

have also been devised to temporarily cut off the senses of smell, taste, touch, heat, and gravity.

In 1954 John Lilly, a neurophysiologist at the National Institute of Mental Health, developed the

sensory deprivation tank. The tank is filled with water that is the same temperature as the human

body, and salts are added to the water so that the body floats, thus reducing the sense of gravity.

The tank is dark and soundproof, and the person’s sense of smell is blocked by the use of

chemicals in the water, such as chlorine.

The sensory deprivation tank has been used for therapy and relaxation. In a typical session for

alternative healing and meditative purposes, a person may rest in an isolation tank for up to an

hour. Treatment in isolation tanks has been shown to help with a variety of medical issues,

including insomnia and muscle pain (Suedfeld, 1990b; Bood, Sundequist, Kjellgren, Nordström,

& Norlander, 2007; Kjellgren, Sundequist, Norlander, & Archer, 2001), [20]

headaches

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(Wallbaum, Rzewnicki, Steele, & Suedfeld, 1991), [21]

and addictive behaviors such as smoking,

alcoholism, and obesity (Suedfeld, 1990a). [22]

Although relatively short sessions of sensory deprivation can be relaxing and both mentally and

physically beneficial, prolonged sensory deprivation can lead to disorders of perception,

including confusion and hallucinations (Yuksel, Kisa, Avdemin, & Goka, 2004). [23]

It is for this

reason that sensory deprivation is sometimes used as an instrument of torture (Benjamin,

2006). [24]

Meditation

Meditation refers to techniques in which the individual focuses on something specific, such as an

object, a word, or one’s breathing, with the goal of ignoring external distractions, focusing on

one’s internal state, and achieving a state of relaxation and well-being. Followers of various

Eastern religions (Hinduism, Buddhism, and Taoism) use meditation to achieve a higher spiritual

state, and popular forms of meditation in the West, such as yoga, Zen, and Transcendental

Meditation, have originated from these practices. Many meditative techniques are very simple.

You simply need to sit in a comfortable position with your eyes closed and practice deep

breathing. You might want to try it out for yourself (Note 5.43 “Video Clip: Try Meditation”).

Video Clip: Try Meditation

Here is a simple meditation exercise you can do in your own home.

Brain imaging studies have indicated that meditation is not only relaxing but can also induce an

altered state of consciousness. Cahn and Polich (2006) [25]

found that experienced meditators in a

meditative state had more prominent alpha and theta waves, and other studies have shown

declines in heart rate, skin conductance, oxygen consumption, and carbon dioxide elimination

during meditation (Dillbeck, Glenn, & Orme-Johnson, 1987; Fenwick, 1987). [26]

These studies

suggest that the action of the sympathetic division of the autonomic nervous system (ANS) is

suppressed during meditation, creating a more relaxed physiological state as the meditator moves

into deeper states of relaxation and consciousness.

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Research has found that regular meditation can mediate the effects of stress and depression, and

promote well-being (Grossman, Niemann, Schmidt, & Walach, 2004; Reibel, Greeson, Brainard,

& Rosenzweig, 2001; Salmon et al., 2004). [27]

Meditation has also been shown to assist in

controlling blood pressure (Barnes, Treiber, & Davis, 2001; Walton et al., 2004). [28]

A study by

Lyubimov (1992) [29]

showed that during meditation, a larger area of the brain was responsive to

sensory stimuli, suggesting that there is greater coordination between the two brain hemispheres

as a result of meditation. Lutz and others (2004) [30]

demonstrated that those who meditate

regularly (as opposed to those who do not) tend to utilize a greater part of their brain and that

their gamma waves are faster and more powerful. And a study of Tibetan Buddhist monks who

meditate daily found that several areas of the brain can be permanently altered by the long-term

practice of meditation (Lutz, Greischar, Rawlings, Ricard, & Davidson, 2004). [31]

It is possible that the positive effects of meditation could also be found by using other methods

of relaxation. Although advocates of meditation claim that meditation enables people to attain a

higher and purer consciousness, perhaps any kind of activity that calms and relaxes the mind,

such as working on crossword puzzles, watching television or movies, or engaging in other

enjoyed behaviors, might be equally effective in creating positive outcomes. Regardless of the

debate, the fact remains that meditation is, at the very least, a worthwhile relaxation strategy.

Psychology in Everyday Life: The Need to Escape Everyday Consciousness

We may use recreational drugs, drink alcohol, overeat, have sex, and gamble for fun, but in some cases these normally

pleasurable behaviors are abused, leading to exceedingly negative consequences for us. We frequently refer to the

abuse of any type of pleasurable behavior as an “addiction,” just as we refer to drug or alcohol addiction.

Roy Baumeister and his colleagues (Baumeister, 1991) [32]

have argued that the desire to avoid thinking about the self

(what they call the “escape from consciousness”) is an essential component of a variety of self-defeating behaviors.

Their approach is based on the idea that consciousness involvesself-awareness, the process of thinking about and

examining the self. Normally we enjoy being self-aware, as we reflect on our relationships with others, our goals, and

our achievements. But if we have a setback or a problem, or if we behave in a way that we determine is inappropriate

or immoral, we may feel stupid, embarrassed, or unlovable. In these cases self-awareness may become burdensome.

And even if nothing particularly bad is happening at the moment, self-awareness may still feel unpleasant because we

have fears about what might happen to us or about mistakes that we might make in the future.

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Baumeister argues that when self-awareness becomes unpleasant, the need to forget about the negative aspects of the

self may become so strong that we turn to altered states of consciousness. Baumeister believes that in these cases we

escape the self by narrowing our focus of attention to a particular action or activity, which prevents us from having to

think about ourselves and the implications of various events for our self-concept.

Baumeister has analyzed a variety of self-defeating behaviors in terms of the desire to escape consciousness. Perhaps

most obvious is suicide—the ultimate self-defeating behavior and the ultimate solution for escaping the negative

aspects of self-consciousness. People who commit suicide are normally depressed and isolated. They feel bad about

themselves, and suicide is a relief from the negative aspects of self-reflection. Suicidal behavior is often preceded by a

period of narrow and rigid cognitive functioning that serves as an escape from the very negative view of the self

brought on by recent setbacks or traumas (Baumeister, 1990). [33]

Alcohol abuse may also accomplish an escape from self-awareness by physically interfering with cognitive

functioning, making it more difficult to recall the aspects of our self-consciousness (Steele & Josephs, 1990). [34]

And

cigarette smoking may appeal to people as a low-level distractor that helps them to escape self-awareness. Heatherton

and Baumeister (1991) [35]

argued that binge eating is another way of escaping from consciousness. Binge eaters,

including those who suffer from bulimia nervosa, have unusually high standards for the self, including success,

achievement, popularity, and body thinness. As a result they find it difficult to live up to these standards. Because

these individuals evaluate themselves according to demanding criteria, they will tend to fall short periodically.

Becoming focused on eating, according to Heatherton and Baumeister, is a way to focus only on one particular activity

and to forget the broader, negative aspects of the self.

The removal of self-awareness has also been depicted as the essential part of the appeal of masochism, in which

people engage in bondage and other aspects of submission. Masochists are frequently tied up using ropes, scarves,

neckties, stockings, handcuffs, and gags, and the outcome is that they no longer feel that they are in control of

themselves, which relieves them from the burdens of the self (Baumeister, 1991). [36]

Newman and Baumeister (1996) [37]

have argued that even the belief that one has been abducted by aliens may be

driven by the need to escape everyday consciousness. Every day at least several hundred (and more likely several

thousand) Americans claim that they are abducted by these aliens, although most of these stories occur after the

individuals have consulted with a psychotherapist or someone else who believes in alien abduction. Again, Baumeister

and his colleagues have found a number of indications that people who believe that they have been abducted may be

using the belief as a way of escaping self-consciousness.

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K E Y T A K E A W A Y S

 Hypnosis is a trance-like state of conscious consisting of heightened susceptibility, deep relaxation, and intense focus.

 Hypnosis is not useful for helping people remember past events, but it can be used to alleviate anxiety and pain.

 Sensory deprivation is the intentional reduction of stimulation to one or more of the senses. It can be used

therapeutically to treat insomnia, muscle tension, and pain.

 Meditation refers to a range of techniques that can create relaxation and well-being.

E X E R C I S E S A N D C R I T I C A L T H I N K I N G

1. Do you think that you would be a good candidate for hypnosis? Why or why not?

2. Try the meditation exercise in this section for three consecutive days. Do you feel any different when or after you

meditate?

[1] Hammond, D. C. (2008). Hypnosis as sole anesthesia for major surgeries: Historical & contemporary

perspectives. American Journal of Clinical Hypnosis, 51(2), 101–121.

[2] Callahan, J. (1997). Hypnosis: Trick or treatment? You’d be amazed at what modern doctors are tackling with an

18th century gimmick. Health, 11, 52–55.

[3] Nash, M., & Barnier, A. (2008). The Oxford handbook of hypnosis: Theory, research and practice: New York, NY:

Oxford University Press.

[4] Baker, E. L., & Nash, M. R. (2008). Psychoanalytic approaches to clinical hypnosis. In M. R. Nash & A. J. Barnier

(Eds.), The Oxford handbook of hypnosis: Theory, research, and practice (pp. 439–456). New York, NY: Oxford

University Press.

[5] Hilgard, E. R. (1965). Hypnotic susceptibility. New York, NY: Harcourt, Brace & World.

[6] Spiegel, H., Greenleaf, M., & Spiegel, D. (2005). Hypnosis. In B. J. Sadock & V. A. Sadock (Eds.), Kaplan &

Sadock’s comprehensive textbook of psychiatry. Philadelphia, PA: Lippincott Williams & Wilkins.

[7] Spanos, N. P. (1991). A sociocognitive approach to hypnosis. In S. J. Lynn & J. W. Rhue (Eds.), Theories of

hypnosis: Current models and perspectives, New York, NY: Guilford Press.

[8] Fassler, O., Lynn, S. J., Knox, J. (2008). Is hypnotic suggestibility a stable trait?Consciousness and Cognition: An

International Journal. 17(1), 240–253.

[9] Kinnunen, T., Zamansky, H. S., & Block, M. L. (1994). Is the hypnotized subject lying?Journal of Abnormal

Psychology, 103, 184–191.

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[10] Jamieson, G. A., & Hasegawa, H. (2007). New paradigms of hypnosis research. Hypnosis and conscious states:

The cognitive neuroscience perspective. In G.A. Jamieson (Ed.), Hypnosis and conscious states: The cognitive

neuroscience perspective (pp. 133–144).New York, NY: Oxford University Press.

[11] Kirsch, I., & Braffman, W. (2001). Imaginative suggestibility and hypnotizability.Current Directions in

Psychological Science. 10(2), 57–61.

[12] Orne, M. T., & Evans, F. J. (1965). Social control in the psychological experiment: Antisocial behavior and

hypnosis. Journal of Personality and Social Psychology, 1(3), 189–200.

[13] Hilgard, E. R., & Cooper, L. M. (1965). Spontaneous and suggested posthypnotic amnesia. International Journal

of Clinical and Experimental Hypnosis, 13(4), 261–273.

[14] Silverman, P. S., & Retzlaff, P. D. (1986). Cognitive stage regression through hypnosis: Are earlier cognitive

stages retrievable? International Journal of Clinical and Experimental Hypnosis, 34(3), 192–204.

[15] Newman, L. S., & Baumeister, R. F. (1996). Toward an explanation of the UFO abduction phenomenon:

Hypnotic elaboration, extraterrestrial sadomasochism, and spurious memories. Psychological Inquiry, 7(2), 99–126.

[16] Kirsch, I., Montgomery, G., & Sapirstein, G. (1995). Hypnosis as an adjunct to cognitive-behavioral

psychotherapy: A meta-analysis. Journal of Consulting and Clinical Psychology, 63(2), 214–220.

[17] Elkins, G., & Perfect, M. (2008). Hypnosis for health-compromising behaviors. In M. Nash & A. Barnier

(Eds.), The Oxford handbook of hypnosis: Theory, research and practice(pp. 569–591). New York, NY: Oxford

University Press.

[18] Cardena, E. (2000). Hypnosis in the treatment of trauma: A promising, but not fully supported, efficacious

intervention. International Journal of Clinical Experimental Hypnosis, 48, 225–238; Montgomery, G. H., David, D.,

Winkel, G., Silverstein, J. H., & Bovbjerg, D. H. (2002). The effectiveness of adjunctive hypnosis with surgical

patients: A meta-analysis.Anesthesia and Analgesia, 94(6), 1639–1645.

[19] Montgomery, G. H., DuHamel, K. N., & Redd, W. H. (2000). A meta-analysis of hypnotically induced analgesia:

How effective is hypnosis? International Journal of Clinical and Experimental Hypnosis, 48(2), 138–153; Patterson,

D. R., & Jensen, M. P. (2003). Hypnosis and clinical pain. Psychological Bulletin, 129(4), 495–521.

[20] Suedfeld, P. (1990b). Restricted environmental stimulation techniques in health enhancement and disease

prevention. In K. D. Craig & S. M. Weiss (Eds.), Health enhancement, disease prevention, and early intervention:

Biobehavioral perspectives (pp. 206–230). New York, NY: Springer Publishing; Bood, S. Å., Sundequist, U., Kjellgren,

A., Nordström, G., & Norlander, T. (2007). Effects of flotation rest (restricted environmental stimulation technique)

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on stress related muscle pain: Are 33 flotation sessions more effective than 12 sessions? Social Behavior and

Personality, 35(2), 143–156; Kjellgren, A., Sundequist, U., Norlander, T., & Archer, T. (2001). Effects of flotation-

REST on muscle tension pain. Pain Research & Management, 6(4), 181–189.

[21] Wallbaum, A. B., Rzewnicki, R., Steele, H., & Suedfeld, P. (1991). Progressive muscle relaxation and restricted

environmental stimulation therapy for chronic tension headache: A pilot study. International Journal of

Psychosomatics. 38(1–4), 33–39.

[22] Suedfeld, P. (1990a). Restricted environmental stimulation and smoking cessation: A 15-year progress

report. International Journal of the Addictions. 25(8), 861–888.

[23] Yuksel, F. V., Kisa, C, Aydemir, C., & Goka, E. (2004). Sensory deprivation and disorders of perception. The

Canadian Journal of Psychiatry, 49(12), 867–868.

[24] Benjamin, M. (2006). The CIA’s favorite form of torture. Retrieved

fromhttp://www.salon.com/news/feature/2007/06/07/sensory_deprivation/print.html

[25] Cahn, B., & Polich, J. (2006). Meditation states and traits: EEG, ERP, and neuroimaging studies. Psychological

Bulletin, 132, 180–211.

[26] Dillbeck, M. C., Cavanaugh, K. L., Glenn, T., & Orme-Johnson, D. W. (1987). Consciousness as a field: The

Transcendental Meditation and TM-Sidhi program and changes in social indicators. Journal of Mind and Behavior.

8(1), 67–103; Fenwick, P. (1987). Meditation and the EEG. The psychology of meditation. In M.A. West (Ed.), The

psychology of meditation (pp. 104–117). New York, NY: Clarendon Press/Oxford University Press.

[27] Grossman, P., Niemann, L., Schmidt, S., & Walach, H. (2004). Mindfulness-based stress reduction and health

benefits: A meta-analysis. Journal of Psychosomatic Research. 57(1), 35–43; Reibel, D. K., Greeson, J. M., Brainard,

G. C., & Rosenzweig, S. (2001). Mindfulness-based stress reduction and health-related quality of life in a

heterogeneous patient population. General Hospital Psychiatry, 23(4), 183–192; Salmon, P., Sephton, S.,

Weissbecker, I., Hoover, K., Ulmer, C., & Studts, J. L. (2004). Mindfulness mediation in clinical practice. Cognitive

and Behavioral Practice, 11(4), 434–446.

[28] Barnes, V. A., Treiber, F., & Davis, H. (2001). Impact of Transcendental Meditation® on cardiovascular function

at rest and during acute stress in adolescents with high normal blood pressure. Journal of Psychosomatic Research,

51(4), 597–605; Walton, K. G., Fields, J. Z., Levitsky, D. K., Harris, D. A., Pugh, N. D., & Schneider, R. H. (2004).

Lowering cortisol and CVD risk in postmenopausal women: A pilot study using the Transcendental Meditation

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program. In R. Yehuda & B. McEwen (Eds.), Biobehavioral stress response: Protective and damaging effects (Annals

of the New York Academy of Sciences) (Vol. 1032, pp. 211–215). New York, NY: New York Academy of Sciences.

[29] Lyubimov, N. N. (1992). Electrophysiological characteristics of sensory processing and mobilization of hidden

brain reserves. 2nd Russian-Swedish Symposium, New Research in Neurobiology. Moscow, Russia: Russian

Academy of Science Institute of Human Brain.

[30] Lutz, A., Greischar, L., Rawlings, N., Ricard, M., & Davidson, R. (2004). Long-term meditators self-induce high-

amplitude gamma synchrony during mental practice.Proceedings of the National Academy of Sciences,

101, 16369–16373.

[31] Lutz, A., Greischar, L., Rawlings, N., Ricard, M., & Davidson, R. (2004). Long-term meditators self-induce high-

amplitude gamma synchrony during mental practice.Proceedings of the National Academy of Sciences,

101, 16369–16373.

[32] Baumeister, R. F. (1991). Escaping the self: Alcoholism, spirituality, masochism, and other flights from the

burden of selfhood. New York, NY: Basic Books.

[33] Baumeister, R. (1990). Suicide as escape from self. Psychological Review, 97(1), 90–113.

[34] Steele, C., & Josephs, R. (1990). Alcohol myopia: Its prized and dangerous effects.American Psychologist, 45(8),

921–933.

[35] Heatherton, T., & Baumeister, R. (1991). Binge eating as escape from self-awareness.Psychological Bulletin,

110(1), 86–108.

[36] Baumeister, R. F. (1991). Escaping the self: Alcoholism, spirituality, masochism, and other flights from the

burden of selfhood. New York, NY: Basic Books.

[37] Newman, L. S., & Baumeister, R. F. (1996). Toward an explanation of the UFO abduction phenomenon:

Hypnotic elaboration, extraterrestrial sadomasochism, and spurious memories. Psychological Inquiry, 7(2), 99–126.

5.4 Chapter Summary

Consciousness is our subjective awareness of ourselves and our environment.

Consciousness is functional because we use it to reason logically, to plan activities, and to

monitor our progress toward the goals we set for ourselves.

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Consciousness has been central to many theories of psychology. Freud’s personality theories

differentiated between the unconscious and the conscious aspects of behavior, and present-day

psychologists distinguish between automatic (unconscious) and controlled (conscious) behaviors

and between implicit (unconscious) and explicit (conscious) cognitive processes.

The French philosopher René Descartes (1596–1650) was a proponent of dualism, the idea that

the mind, a nonmaterial entity, is separate from (although connected to) the physical body. In

contrast to the dualists, psychologists believe the consciousness (and thus the mind) exists in the

brain, not separate from it.

The behavior of organisms is influenced by biological rhythms, including the daily circadian

rhythms that guide the waking and sleeping cycle in many animals.

Sleep researchers have found that sleeping people undergo a fairly consistent pattern of sleep

stages, each lasting about 90 minutes. Each of the sleep stages has its own distinct pattern of

brain activity. Rapid eye movement (REM) accounts for about 25% of our total sleep time,

during which we dream. Non-rapid eye movement (non-REM) sleep is a deep sleep

characterized by very slow brain waves, and is further subdivided into three stages: stages N1,

N2, and N3.

Sleep has a vital restorative function, and a prolonged lack of sleep results in increased anxiety,

diminished performance, and if severe and extended, even death. Sleep deprivation suppresses

immune responses that fight off infection, and can lead to obesity, hypertension, and memory

impairment.

Some people suffer from sleep disorders, including insomnia, sleep apnea, narcolepsy,

sleepwalking, and REM sleep behavior disorder.

Freud believed that the primary function of dreams was wish fulfillment, and he differentiated

between the manifest and latent content of dreams. Other theories of dreaming propose that we

dream primarily to help with consolidation—the moving of information into long-term memory.

The activation-synthesis theory of dreaming proposes that dreams are simply our brain’s

interpretation of the random firing of neurons in the brain stem.

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Psychoactive drugs are chemicals that change our states of consciousness, and particularly our

perceptions and moods. The use (especially in combination) of psychoactive drugs has the

potential to create very negative side effects, including tolerance, dependence, withdrawal

symptoms, and addiction.

Stimulants, including caffeine, nicotine, cocaine, and amphetamine, are psychoactive drugs that

operate by blocking the reuptake of dopamine, norepinephrine, and serotonin in the synapses of

the central nervous system (CNS). Some amphetamines, such as Ecstasy, have very low safety

ratios and thus are highly dangerous.

Depressants, including alcohol, barbiturates, benzodiazepines, and toxic inhalants, reduce the

activity of the CNS. They are widely used as prescription medicines to relieve pain, to lower

heart rate and respiration, and as anticonvulsants. Toxic inhalants are some of the most

dangerous recreational drugs, with a safety index below 10, and their continued use may lead to

permanent brain damage.

Opioids, including opium, morphine, heroin, and codeine, are chemicals that increase activity in

opioid receptor neurons in the brain and in the digestive system, producing euphoria, analgesia,

slower breathing, and constipation.

Hallucinogens, including cannabis, mescaline, and LSD, are psychoactive drugs that alter

sensation and perception and which may create hallucinations.

Even when we know the potential costs of using drugs, we may engage in using them anyway

because the rewards from using the drugs are occurring right now, whereas the potential costs are

abstract and only in the future. And drugs are not the only things we enjoy or can abuse. It is

normal to refer to the abuse of other behaviors, such as gambling, sex, overeating, and even

overworking as ―addictions‖ to describe the overuse of pleasant stimuli.

Hypnosis is a trance-like state of consciousness, usually induced by a procedure known as

hypnotic induction, which consists of heightened suggestibility, deep relaxation, and intense

focus. Hypnosis also is frequently used to attempt to change unwanted behaviors, such as to

reduce smoking, eating, and alcohol abuse.

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Sensory deprivation is the intentional reduction of stimuli affecting one or more of the five

senses, with the possibility of resulting changes in consciousness. Although sensory deprivation

is used for relaxation or meditation purposes and to produce enjoyable changes in consciousness,

when deprivation is prolonged, it is unpleasant and can be used as a means of torture.

Meditation refers to techniques in which the individual focuses on something specific, such as an

object, a word, or one’s breathing, with the goal of ignoring external distractions. Meditation has

a variety of positive health effects.

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