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Unformatted text preview: Ch.4 States of Consciousness I. our awareness of ourselves and our environment A. external events, internal sensations, thoughts, feelings, and self II. exists on continuum III.not controlled by one brain area, but by patterns of brain activation IV.consciousness A. studied with electroencephalogram (EEG) i. electrodes on scalp measure waves of electrical activity from brain ii. waves differ in amplitude (height) and frequency (speed of occurrence) V. stages of sleep A. distinctive changes in brain activity and physiology as you pass through levels of sleep B. alpha stage: awake, drowsy i. brain producing alpha waves C. Non-REM sleep: i. most of sleep ii. divided into stages D. pg. 128 E. stage 1: i. transition from wakefulness ii. lasts only a few minutes iii.may experience: a) dreams, mild hallucinations, sensation of falling, floating, body jerks iv. theta waves F. stage 2: i. tension, heart rate, BP, temp, respiration decrease ii. theta waves, with sleep spindles: 1-2 second long high frequency bursts of brain activity iii.sleep talking occurs in some G. stages 3&4: Delta sleep H. stage 3: i. transition between stage 2 and deep sleep ii. continued relaxation, slow steady heart and breathing rate iii.some delta waves appear I. stage 4: i. very deep sleep, hard to wake ii. body very relaxed; BP, temp, breathing, blood to brain reduced iii.delta waves dominate iv. bed wetting, sleep walking occur v. still somewhat aware of environment VI.stages of sleep: REM A. after stage 4, go back up through stages i. 1-2-3-4-3-2 B. instead of re-entering stage one, you enter 5 th stage: REM C. cycle repeats throughout the sleep period i. 1-2-3-4-3-2-REM-2-3-4-3-2-REM...
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This note was uploaded on 11/15/2010 for the course PSYCH 36-087 taught by Professor Welsh during the Fall '10 term at UGA.
- Fall '10