| A | B |
|---|
| Consciousness | awareness of oneself and one’s environment |
| Selective attention | the focusing of attention on a particular stimulus |
| unconscious | according to Freud, a reservoir of mostly unacceptable thoughts, wishes, feelings, and memories of which we are unaware but which influences our behavior |
| altered state of consciousness | a type of consciousness other than normal waking consciousness |
| circadian rhythm | a regular sequence of biological processes, such as temperature and sleep, that occurs every 24 hours |
| REM sleep | a stage of sleep characterized by rapid eye movements and linked to dreaming |
| insomnia | a sleep disorder characterized by recurring problems in falling asleep or staying asleep |
| night error | a sleep disorder characterized by high arousal and apparent fear; unlike nightmares, not remembered |
| narcolepsy | an uncommon sleep disorder characterized by brief attacks of REM sleep, often at inopportune moments |
| biofeedback | a system for monitoring and feeding back information about certain biological processes, such as blood pressure |
| hypnosis | a condition in which people appear to be highly suggestible and to behave as if they are in a trance |
| posthypnotic suggestion | instructions given to a person under hypnosis that are supposed to be carried out after the hypnosis session has ended |
| addiction | a compulsive need for and use of a habit- forming substance |
| depressants | a drug that reduces neural activity and slows body functions |
| narcotics | a type of drug that dulls the senses, relieves pain, and induces sleep; the term is usually reserved for those drugs derived from the opium poppy plant |
| stimulant | a drug that increases neural activity and speeds up body functions |
| hallucinogen | a psychedelic drug, such as LSD, that distorts perceptions and evokes sensory images in the absence of actual sensory input |
| delusion | an erroneous belief, as of persecution or grandeur, that may accompany certain psychotic disorders |
