EEG and Sleep Stages

EEG and Sleep Stages - waves. Consists of moderately slow...

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PsychSim 5: EEG AND SLEEP STAGES Name: Kai-Ting,Chen Section: S01 Date: 2/11/10 This activity provides an explanation of the measurement of brain activity, as well as the presence of different sleep patterns and their respective functions. EEG How is the brain’s electrical activity recorded? Electrodes placed on the scalp can detect these signals. When the signals are amplified and fed into a special type of physiograph called an electroencephalogram (EEG), scientists can obtain a permanent record of the gross activity of the brain. Stages of Sleep Complete the following table: Characteristic EEG Pattern Stage 1 Transition into sleep Showing a mixture of small, fast waves and slightly slower waves. Stage 2 Beginning of slow-wave sleep, marked by bursts of activity called sleep spindles. Consists of moderately slow waves interspersed with bursts of rapid activity. Stage 3 Marked by appearance of very large, very slow waves called delta
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Unformatted text preview: waves. Consists of moderately slow waves interspersed with very slow, very large delta waves. Stage 4 Mostly delta waves Consists almost entirely of delta waves. REM Sleep Fast, small waves indicating intense brain activity Consist of fast, small waves similar to those from a person who is awake and alert. Sleep Thoughts vs. True Dreams If people have vivid, realistic dreams during REM sleep, why dont they act out those dreams, perhaps injuring themselves or others? During REM sleep most motor neurons are inhibited, producing a kind of paralysis that keeps people from hurting themselves during a dream. Purpose of Sleep What are the two main purposes of sleep? 1. It reduces our energy expenditures so that the bodys resources can be mobilized for tissue repairs and growth. 2. Important for the brains work of organizing and consolidating the memories of the days events....
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EEG and Sleep Stages - waves. Consists of moderately slow...

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