Circandian Rhythm. A cycle or rhythm this is roughly 24 hours long; the cyclical daily fluctuations...
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Transcript of Circandian Rhythm. A cycle or rhythm this is roughly 24 hours long; the cyclical daily fluctuations...
![Page 1: Circandian Rhythm. A cycle or rhythm this is roughly 24 hours long; the cyclical daily fluctuations in biological and psychological process.](https://reader036.fdocuments.in/reader036/viewer/2022081603/56649e565503460f94b4e307/html5/thumbnails/1.jpg)
Circandian Rhythm
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• A cycle or rhythm this is roughly 24 hours long; the cyclical daily fluctuations in biological and psychological process
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Superchiasmatic nucle us (SCN)
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• A cluster of neurons in the hypothalamus in the brain that governs the timing of circadian rhythms
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Melatonin
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• A hormone manufactured by the pineal gland that produces sleepiness
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Electroencephalograph
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• An instrument that uses electrodes placed on the scale to measure and record the brain’s electrical activity
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EEG (electroencephalogram)
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• The graphic record of brain activity produced by an electroencephalograph
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REM sleep
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• Type of sleep during which rapid eye movements and dreaming usually occur and voluntary muscle activity is suppressed: also called active sleep or paradoxical sleep
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NREM Sleep
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• Quiet typically dreamless sleep in which rapid eye movements are absent; divided into four stages; also called quiet sleep
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Beta brain waves
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• Brain-wave pattern associated with alert wakefulness
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Alpha brain waves
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• Brain-wave pattern associated with relaxed wakefulness and drowsiness
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Hypnagogic hallucinations
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• Vivid sensory phenomena that occur during the onset of sleep
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Sleep spindles
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• Short bursts of brain activity that characterize stage 2 NREM sleep
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K complex
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• Single but large high-voltage spike of brain activity that characterizes stage 2 NREM sleep
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REM rebound
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A phenomenon in which a person who is deprived of REM sleep greatly increases the amount of time spent in REM sleep at the first opportunity to sleep uninterrupted
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Restorative theory of sleep
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The view that sleep and dreaming are essential to normal physical and mental functioning
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Adaptive theory of sleep
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The view that the unique sleep patterns of different animals evolved over time to help promote survival and environmental adaptation; also referred to as the evolutionary theory of sleep
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Sleep disorders
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Serious disturbances in the normal sleep pattern that interfere with daytime functioning and cause subjective distress
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Insomnia
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A condition in which a person regularly experiences an inability to fall asleep, to stay asleep, or to feel adequately rested by sleep
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Restless legs syndrome (RLS)
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A condition in which unpleasant sensations in the lower legs are accompanied by an irresistible urge to move the legs, temporarily relieving the unpleasant sensation but disrupting sleep
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Sleep apnea
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A sleep disorder in which the person repeatedly stops breathing during sleep
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Sleepwalking
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A sleep disturbance characterized by an episode of walking or performing other actions during stage 3 or stage 4 NREM sleep; also called somnambulism
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Night terrors
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A sleep disturbance characterized by an episode of increased physiological arousal, intense fear and panic, frightening hallucinations, and no recall of the episode the next morning; typically occurs during stage 3 or stage 4 NREM sleep; also called sleep terrors
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Parasomnias
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A category of sleep disorders characterized by arousal or activation during sleep or sleep transitions; includes sleepwalking, night terrors, sleep bruxism, and REM sleep behavior disorder
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REM sleep behavior disorder
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A sleep disorder in which the sleeper acts out his or her dreams
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Dream
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A storylike episode of unfolding mental imagery during sleep
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Nightmare
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A frightening or unpleasant anxiety dream that occurs during REM sleep
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Manifest content
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In Freud’s psychoanalytic theory, the elements of a dream that are consciously experienced and remembered by the dreamer
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Latent content
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In Freud’s psychoanalytic theory, the unconscious wishes, thoughts, and urges that are concealed in the manifest content of a dream
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Activation-synthesis model of dreaming
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The theory that brain activity during sleep images (activation), which are combined by the brain into a dream story (synthesis)
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Hypnosis
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A cooperative social interaction in which the hypnotized person responds to the hypnotist’s suggestions which changes in perception, memory, and behavior
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Posthypnotic suggestion
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A suggestion made during hypnosis that the person should carry out a specific instruction following the hypnotic session
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Posthypnotic amnesia
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The inability to recall specific information because of a hypnotic suggestion
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Hypermnesia
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The supposed enhancement of a person’s memory for past events through a hypnotic suggestion
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Dissociations
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The splitting of consciousness into two or more simultaneous streams of mental activity
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Neodissoication theory of hypnosis
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Theory proposed by Ernest Hilgard that explains hypnotic effects as being due to the splitting of consciousness into two simultaneous streams of mental activity, only one of which the hypnotic participant is consciously aware of during hypnosis
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Hidden observer
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Hilgard’s term for the hidden, or dissociated stream of mental activity during hypnosis
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Meditation
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Any one of a number of sustained concentration techniques that focus attention and heighten awareness
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Psychoactive drug
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A drug that alters consciousness, perception, mood, and behavior
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Physical dependence
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A condition in which a person has physically adapted to a drug so that he or she must take the drug regularly in order avoid withdrawal symptoms
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Drug tolerance
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A condition in which increasing amounts of a physically addictive drug are needed to produce the original, desired effect
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Withdrawal symptoms
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Unpleasant physical reactions, combined with intense drug cravings, that occur when a person abstains from a drug on which he or she is physically dependant
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Drug rebound effect
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Withdrawal symptoms that are the opposite of a physically addictive drug’s action
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Drug abuse
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Recurrent drug use that results in disruptions in academic, social, or occupational functioning or in legal or psychological problems
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Depressants
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A category of psychoactive drugs that depress or inhibit brain activity
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Barbiturates
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A category of depressant drugs that reduce anxiety and produce sleepiness
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Tranquilizers
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Depressant drugs that relieve anxiety
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Inhalants
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Chemical substances that are inhaled to produce an alteration in consciousness
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Opiates
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A category of psychoactive drugs that are chemically similar to morphine and have strong pain-relieving properties
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Stimulants
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A category of psychoactive drugs that increase brain activity, arouse behavior, and increase mental alertness
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Caffeine
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A stimulant drug found in coffee, tea, cola drinks, chocolate, and many over-the-counter medications
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Nicotine
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A stimulant drug found in tobacco products
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Amphetamines
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A class of stimulant drugs that arouse the central nervous system and suppress appetite
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Cocaine
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A stimulant drug derived from the coca tree
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Stimulant-induced psychosis
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Schizophrenia-like symptoms that can occur as the result of prolonged amphetamine or cocaine use; also called amphetamine psychosis or cocaine psychosis
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Psychedelic drugs
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A category of psychoactive drugs that create sensory and perceptual distortions, alter mood, and affect judgment
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Mescaline
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A psychedelic drug derived from the peyote cactus
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LSD
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A synthetic drug
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Marijuana
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A psychoactive drug derived from the hemp plant
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MDMA or ecstasy
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Synthetic club drug that combines stimulant and mild psychedelic effects
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Dissociative anesthetics
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Class of drugs that reduce sensitivity to pain and produce feelings of detachment and dissociation; includes the club drugs phencyclidine (PCP) and ketamine
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Sigmund Freud (1856-1939)
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Founder of psychoanalysis; proposed that dream images are disguised and symbolic expressions of unconscious wishes and urges
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Ernest R. Hilgard (1904-2001)
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American psychologist who extensively studied hynosis and advanced the neodissociation theory of hypnosis
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J. Allan Hobson (b. 1933)
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Contemporary American psychiatrist and neurobiologist who has extensively researched sleep and dreaming; proposed the activation-synthesis model of dreaming
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William James (1842-1910)
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American psychologist and philosopher who proposed that the subjective experience of consciousness is an ongoing stream of mental activity