Quizlet for Unit of Sleep, Dreams, and Drugs

consciousness

our subjective awareness of ourselves and our environment.

hypnosis

a social interaction in which one person (the hypnotist) suggests to another (the subject) that certain perceptions, feelings, thoughts, or behaviors will spontaneously occur.

posthypnotic suggestion

a suggestion, made during a hypnosis session, to be carried out after the subject is no longer hypnotized; used by some clinicians to help control undesired symptoms and behaviors.

dissociation

a split in consciousness, which allows some thoughts and behaviors to occur simultaneously with others.

circadian rhythm

the biological clock; regular bodily rhythms (for example, of temperature and wakefulness) that occur on a 24-hour cycle.

REM sleep

rapid eye movement sleep; a recurring sleep stage during which vivid dreams commonly occur.

alpha waves

the relatively slow brain waves of a relaxed, awake state.

sleep

a periodic, natural loss of consciousness—as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation.

hallucinations

false sensory experiences, such as seeing something in the absence of an external visual stimulus.

delta waves

the large, slow brain waves associated with the deep sleep of NREM-3.

NREM sleep

non-rapid eye movement sleep; encompasses all sleep stages except for REM sleep.

suprachiasmatic nucleus (SCN)

a pair of cell clusters in the hypothalamus that controls circadian rhythm.

insomnia

recurring problems in falling or staying asleep.

narcolepsy

a sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times.

sleep apnea

a sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings.

night terrors

a sleep disorder characterized by high arousal and an appearance of being terrified.

dream

a sequence of images, emotions, and thoughts passing through a sleeping person's mind.

manifest content

according to Freud, the symbolic, remembered story line of a dream (as distinct from its latent, or hidden, content).

latent content

according to Freud, the underlying meaning of a dream (as distinct from its manifest content).

REM rebound

the tendency for REM sleep to increase following REM sleep deprivation.

substance use disorder

a disorder characterized by continued substance craving and use despite significant life disruption and/or physical risk.

psychoactive drug

a chemical substance that alters perceptions and moods.

tolerance

the diminishing effect with regular use of the same dose of a drug, requiring the user to take larger and larger doses before experiencing the drug's effect.

withdrawal

the discomfort and distress that follow discontinuing an addictive drug or behavior.

depressants

drugs (such as alcohol, barbiturates, and opiates) that reduce neural activity and slow body functions.

alcohol use disorder (popularly known as alcoholism)

alcohol use marked by tolerance, withdrawal, and a drive to continue problematic use.

barbiturates

drugs that depress central nervous system activity, reducing anxiety but impairing memory and judgment.

opiates

opium and its derivatives, such as morphine and heroin; they depress neural activity, temporarily lessening pain and anxiety.

stimulants

drugs (such as caffeine, nicotine, and the more powerful cocaine, amphetamines, methamphetamine, and Ecstasy) that excite neural activity and speed up body functions.

amphetamines

drugs, such as methamphetamine, that stimulate neural activity, causing accelerated body functions and associated energy and mood changes.

nicotine

a stimulating and highly addictive psychoactive drug in tobacco.

cocaine

a powerful and addictive stimulant derived from the coca plant; producing temporarily increased alertness and euphoria.

methamphetamine

a powerfully addictive drug that stimulates the central nervous system, with accelerated body functions and associated energy and mood changes.

Ecstasy (MDMA)

a synthetic stimulant and mild hallucinogen. Produces euphoria and social intimacy, but with short-term health risks and longer-term harm to serotonin-producing neurons and to mood and cognition.

hallucinogens

psychedelic ("mind-manifesting") drugs, such as LSD, that distort perceptions and evoke sensory images in the absence of sensory input.

LSD

a powerful hallucinogenic drug; also known as acid (lysergic acid diethylamide).

near-death experience

an altered state of consciousness reported after a close brush with death (such as through cardiac arrest); often similar to drug-induced hallucinations.

THC

the major active ingredient in marijuana; triggers a variety of effects, including mild hallucinations.

hypnagogic sensations

bizarre experiences, such as jerking or a feeling of falling or floating weightlessly, while transitioning to sleep.