PSYC 280 Study Guide - Muscle Tone, Isolated Brain, Cataplexy

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Document Summary

Sleeping and waking: different stages: electro-oculography (eog): brain activity of eye movements, electromyography (emg): brain activity of muscle tension. 2 classes of sleep: slow-wave sleep (sws) and rapid-eye-movement sleep (rem) Desynchronized eeg: beta activity; mixture of different high frequencies with low amplitude. Alpha rhythm: 8-12 hz that occurs during relaxed wakefulness. Vertex spikes: drowsiness, time spent in alpha rhythm decreases, eeg:small amplitude, irregular frequency. Beginning of stage 1 sleep: slowing of heart rate, reduction of muscle tension, eyeballs roll slowly. Sleep spindles: stage 2 sleep: waves of 12-14 hz periodic burts, k complexes. If awakened during the first 2 stages, they deny that they were asleep. How much we sleep and when young adults: 7-8 hrs, about half in stage 2. Rem=20% of total sleep; cycles of 90-110min recurring 4 or 5 times per night. Cycles early in night=greater amounts of stage 3 sws, and latter half of night=less stage 3.