Consciousness

Consciousness - Consciousness Tobeaware(varyinglevels)...

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Consciousness 18:01 To be aware (varying levels) Measurement and Sleep Electroencephalograph Overall electrical brain activity Levels  measured by EEG Awake has high frequency, low amplitude So many activities and waves canceling amplitudes out Drowsy has slightly decreased frequency, higher amplitude (alpha) Stage 1 of sleep   same changes (theta waves) Light sleep Muscle activity slows down, occasional twitching Don’t realize you’re asleep Stage 2 of sleep   same changes Sleep spindle (doodle) K(nock) Complexes (spike) Helps to keep person asleep Breathing and heart rate slow Slight decrease in body temp. Still light sleep Stages 3 and 4   same changes (delta waves)
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3 Deep sleep (slow wave sleep) Brain begins delta waves 4 Very deep sleep Rhythmic breathing REM Sleep   low voltage, random, fast, with sawtooth waves Muscle atonia (paralyzed) Rapid eye movement Brainwaves speed up   dreaming Breathing is rapid and shallow Stages cycle 4-5 times per night More REM in each progressive cycle Mechanism of sleep/arousal Suprachiasmatic nucleus (in hypothalamus)   major biological clock 24 hour schedule (circadian rhythm) Can be entrained by light SCN (sleepiness) Pineal gland Melatonin Biological and environmental clocks “out of sync”   jet lag
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Purpose of Sleep Energy conservation (less movement and less heat production) Disproven by dolphins Protection against predators Lions Restore bodily resources Rats prove true
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This note was uploaded on 02/22/2012 for the course PSYC 101 taught by Professor Loeb during the Fall '08 term at UNC.

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Consciousness - Consciousness Tobeaware(varyinglevels)...

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