Lecture 11 - I. Consciousness - Sleep A. Cycle of Sleep...

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I. Consciousness --- Sleep A. Cycle of Sleep Stages B. Age Changes, Alcohol Effects, Sleep Deprivation C. 4 Perspectives on Dreaming I. ‘Altered States’ of Consciousness A. Hypnosis B. Meditation C. Psychoactive Drugs
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Sleep—Circadian Rhythms The sleep cycle is based on circadian rhythms (internal patterns of bodily functions over a ~24-hour period) A key brain area is the suprachiasmatic nucleus (SCN) in the hypothalamus; it influences the hypothalamus and reticular formation to keep our temperature, hunger, sleep, etc. on a synchronized schedule. SCN receives input from the retina, getting information about light/dark cycles.
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Sleep—Circadian Rhythms Disruptions to the circadian rhythm… can lead to thinking less clearly, inattentiveness, and feeling sleepy due to shifting work schedules, jet lag, pulling an “all nighter”
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EEGs Graphically record brain-wave activity through electrodes on the scalp and forehead EEG waves vary in frequency and amplitude frequency: amplitude:
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High and mixed freq., low amplitude Lower freq., high amplitude High freq., low amplitude From http://www.lechin.com
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Lecture 11 - I. Consciousness - Sleep A. Cycle of Sleep...

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