1.
alpha waves: The relatively slow brain waves of a relaxed, awake state
2.
amphetamines: Drugs that stimulate neural activity, causing speeded-up body functions and associated energy and mood changes
3.
barbiturates: Drugs that depress the activity of the central nervous system, reducing anxiety but imparing memory and judgment
4.
biological rhythms: Periodic physiological fluctuations
5.
circadian rhythm: The biological clock; regular bodily rhythms that occur on a 24-hour cycle
6.
consciousness: Our awareness of ourselves and our environment
7.
delta waves: The large, slow brain waves associated with deep sleep
8.
depressants: Drugs that reduce neural activity and slow body functions
9.
dissociation: A split in consciousness, which allows some thoughts to occur simultaneously with others
10.
dream: A sequence of images, emotions, and thoughts passing through a sleeping person's mind
11.
dualism: The presumption that mind and body are two distinct entities that interact
12.
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
13.
hallucinogens: Psychedelic drugs that distort perceptions and evoke sensory images in the absence of sensory imput
14.
halluncinations: False sensory experiences, such as seeing something in the absence of an external visual stimulus
15.
hidden observer: Hilgard's term describing a hypnotized subject's awareness of experiences, such as pain, that go unreported during hypnosis
16.
hypnosis: A social interaction in which one person suggests to another that certain perceptions, feelings, thoughts, or behaviors will spontaneously occur
17.
insomnia: Recurring problems in falling or staying asleep
18.
latent content: According to Freud, the underlying meaning of a dream
19.
LSD: A powerful hallucinogenic drug; also known as acid
20.
manifest content: According to Freud, the remembered story line of a dream
21.
monism: The presumption that mind and body are different aspects of the same thing
22.
narcolepsy: A sleep disorder characterized by uncontrollable sleep attacks
23.
near-death experience: An altered state of consciousness reported after close brush with death
24.
night terrors: A sleep disorder characterized by high arousal and an appearance of being terrified; occur during Stage 4 sleep and are seldom remembered
25.
opiates: Drugs that depress neural activity, temporarily lessenging pain and anxiety
26.
physical dependence: A physiological need for a drug, marked by unpleasant withdrawal symptoms when the drug is discontinued
27.
posthypnotic amnesia: Supposed inability to recall what one experienced during hypnosis; induced by the hypnotist's suggestion
28.
posthypnoyic suggestion: A suggestion, made during a hypnosis session, to be carried out after the subject is no longer hypnotized
29.
psychoactive drug: A chemical substance that alters perceptions and mood
30.
psychological dependence: A psychological need to use a drug, such as to relieve negative emotions
31.
REM rebound: The tendency for REM sleep to increase following REM sleep deprivation
32.
REM sleep: Rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur
33.
sleep: Periodic, natural, reversible loss of consciousness - as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation
34.
sleep apnea: A sleep disorder characterized by temporary cessations of breathing during sleep and consequent momentary reawakenings
35.
stimulants: Drugs that excite neural activity and speed up body functions
36.
THC: The major active ingredient in marijuana; triggers a variety of effects, including mild hallucinations
37.
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
38.
withdrawal: The discomfort and distress that follow discontinuing the use of an addictive drug
