rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur. Also known as paradoxical sleep, because the muscles are relaxed (except for minor twitches) but other body systems are active.
periodic, natural, reversible loss of consciousness--as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation
a false sensory perception that seems to be real but for which there is not an actual external stimulus
a sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times
a sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings
a sleep disorder characterized by high arousal and an appearance of being terrified; unlike nightmares, night terrors occur during Stage 4 sleep, within two or three hours of falling asleep, and are seldom remembered
the tendency for REM sleep to increase following REM sleep deprivation (created by repeated awakenings during REM sleep)
a social interaction in which one person suggests to another that certain perceptions, feelings, thoughts, or behaviors will spontaneously occur
Post Hypnotic Amnesia
supposed inability to recall what one experienced during hypnosis, induced by the hypnotist's suggestion.
Post Hypnotic 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.
a split in consciousness, which allows some thoughts and behaviors to occur simultaneously with others.
Hilgard's term describing a hypnotized subject's awareness of experiences, such as pain, that go unreported during hypnosis
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
a physiological need for a drug, marked by unpleasant withdrawal symptoms when the drug is discontinued
drugs that reduce neural activity and slow body functions (ex. alcohol, barbiturates, and opiates)
psychedelic drugs, such as LSD, that distort perceptions and evoke sensory images in the absence of sensory input
drugs that depress the activity of the central nervous system, reducing anxiety but impairing memory and judgment
opium and its derivatives, such as morphine and heroin; they depress neural activity, temporarily lessening pain and anxiety.
drugs that stimulate neural activity, causing speeded-up body functions and associated energy and mood changes
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.