| addiction | A pattern of behavior characterized by an overwhelming need to use the drug and to secure its supply. p. 179
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| alcoholism | A disorder that involves long-term, repeated, uncontrolled, compulsive, and excessive use of alcoholic beverages and that impairs the drinker's health and work and social relationships. p. 182
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| automatic processes | States of consciousness that require little attention and do not interfere with other ongoing activities. p. 161
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| barbiturates | Depressant drugs that decrease the activity of the central nervous system. p. 183
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| biological rhythms | Periodic physiological fluctuations in the body. p. 164
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| circadian rhythms | Daily behavioral or physiological cycles, such as the sleep/wake cycle. p. 164
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| consciousness | Awareness of external events and internal sensations, including awareness of the self and thoughts about one's experiences. p. 160
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| controlled processes | The most alert states of consciousness. p. 161
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| depressants | Psychoactive drugs that slow down mental and physical activity. p. 180
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| hallucinogens | Psychoactive drugs that modify a person's perceptual experiences and produce visual images that are not real. p. 185
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| hypnosis | A psychological state or possibly altered attention and awareness in which the individual is unusually responsive to suggestions. p. 175
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| opiates | Opium and its derivatives; they depress the central nervous system's activity. p. 183
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| physical dependence | The physical need for a drug, accompanied by unpleasant withdrawal symptoms when the drug is discontinued. p. 179
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| psychoactive drugs | Drugs that act on the nervous system to alter consciousness, modify perceptions, and change moods. p. 179
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| psychology | The scientific study of behavior and mental processes. p. 7
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| REM sleep | Rapid-eye-movement sleep; stage 5 of sleep, in which most dreaming occurs. p. 169
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| stream of consciousness | James' concept that the mind is a continuous flow of sensations, images, thoughts, and feelings. p. 160
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| stimulants | Psychoactive drugs that increase the central nervous system's activity. p. 183
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| tolerance | The need to take increasing amounts of the drug to produce the same effect. p. 179
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| tranquilizers | Depressant drugs that reduce anxiety and induce relaxation. p. 183
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| unconscious thought | Freud's concept of a reservoir of unacceptable wishes, feelings, and thoughts that are beyond conscious awareness. p. 163
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| wish fulfillment | Freud's concept of dreaming as an unconscious attempt to fulfill needs (especially for sex and aggression) that cannot be expressed, or that go ungratified, while awake. p. 173
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