PSY 120 Notes (4.10) - PSY 120 Notes (4/10/08)...

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PSY 120 Notes (4/10/08) Consciousness Altered states of consciousness Why do we sleep? Rhythm of sleep Our bodies are in sync with 24-hr cycle of day and night through a biological clock Circadian rhythm Sleep Cycle Every 90 ins Stage 4 very brief- REM gets longer Sleep Stages Stage 0= eyes closed, Stage 1= breathing slows, light sleep Experience fantastic images like hallucinations, sensation of falling Body jerks suddenly EEG- relatively slow alpha waves Stage 2= relax more deeply, easily awoken (lasts ~20 mins) Brain waves slow further and show irregular waves Lasts ~20 mins A transitional phase to the deep sleep of stage 4 Stage 3=? Stage 4= deep sleep Deep sleep Large delta waves (~30 mins) Hard to awaken Sleep talk, sleep walk, wet the bed Then go back through stages 2 and 3 REM sleep Very rapid brain waves (as if awake) Heart rate rises, breathing increases Sexually aroused
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This note was uploaded on 04/20/2008 for the course PSY 120 taught by Professor Donnely during the Spring '08 term at Purdue University-West Lafayette.

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PSY 120 Notes (4.10) - PSY 120 Notes (4/10/08)...

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