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11 terms

Sleep and Biological Rhythms

behavioral neuroscience Ch 9
alpha activity
smooth electrical activity of 8-12 Hz recorded from the brain; generally associated with a state of relaxation (eyes closed)
beta activity
irregular electrical activity of 13-30 Hz recorded from the brain; generally associated with a state of arousal
reflects the fact that many different neural circuits in the brain are actively processing information; occurs when thinking actively (beta activity)
theta activity
electrical activity of 3.5-7.5 Hz that occurs intermittently during early stages of slow-wave sleep and REM sleep
delta activity
regular, synchronous electrical activity of less than 4 Hz recorded from the brain; occurs during the deepest stages of slow-wave sleep
slow-wave sleep
Non-REM sleep characterized by synchronized EEG activity during deeper stages of sleep
REM sleep
a period of desynchronized EEG activity during sleep at which time dreaming, rapid eye movements, and muscular paralysis occur; also called paradoxical sleep
REM sleep
occurs at regular 90 minute intervals, 45 min after stage 4
stage 4
deepest stage of sleep where only loud noises will cause a person to awaken, and when awakened the person feels groggy and confused
visual association cortex
during REM sleep, area of brain with high rate of cerebral blood flow
a peptide (hypocretin) produced by neurons whose cell bodies are located in the hypothalamus; destruction leads to narcolepsy