PSY_200_Test_2_Guide_4 - We sleep to save energy and be...

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States of Consciousness Consciousness: The awareness of one’s own mental activity, including thoughts, feelings, and sensations. Sleep: We spend about 1/3 of our day in altered state of consciousness called sleep. Circadian Rhythms: A rhythm of activity and inactivity lasting about a day. o The rising and setting of the sun provide cues to reset our rhythm each day. o Without cues most people generate a waking-sleeping rhythm of a little longer than 24 hours, which gradually drifts out of phase with the clock. o Jet Lag: A period of discomfort and inefficiency while your internal clock is out of phase with your new surroundings. Most people find it easier to adjust when they are flying west, where they go to bed later, than flying east, where they go to bed earlier. Electroencephalograph (EEG): Measures and amplifies tiny electrical changes on the scalp that reflect patterns of brain activity o When used in a sleep study, EEG’s tell us what Stage of sleep the person is in.
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Unformatted text preview: We sleep to save energy and be more aware. Non-REM Sleep o Stage 1 Eyes are nearly motionless EEG shows short, choppy waves, which indicates a fair amount of brain activity Theta waves o Stage 2 EEG shows some long slow waves Sleep spindles o Stage 3 EEG shows more long slow waves than Stage 2 Delta waves o Stage 4 EEG shows more long slow waves than Stage 3 50% Delta waves REM Sleep o Like Stage 1 of non-REM except there are rapid eye movements o Spend 20%-25% of an average night in REM sleep. 1-2-3-4-3-2-REM-1-2-3-4-3-2-REM Each cycle lasts 90-100 minutes Over the course of the night Stages 3 and 4 become shorter while Stage 2 and REM increase in duration. There are about 5 sleep cycles a night. As people grow older, the amount of sleep per day decreases, as well as the amount of REM sleep (infants need/get the most)....
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This note was uploaded on 04/28/2009 for the course PSY 200 taught by Professor Craig during the Spring '08 term at N.C. State.

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