PSYC 370 Lecture Notes - Lecture 17: Cadence Skill, Group Delay And Phase Delay, Lightdark
11 Mar 2017
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4 stages of eeg sleep that follow wakefulness (low voltage, high frequency waves) Slow wave sleep (sws)- stage 3 & 4: stage 3: occasional delta waves, delta wave- largest & slowest eeg wave, frequency of 1-2 hz, stage 4: predominantly delta waves. Sleeper progresses to stage 4 sleep and then back to 3, 2, and (emergent) stage 1. 90-minute cycles, as night progresses, emergent stage 1 is more frequent & longer: 60min non-rem; 30 min rem. Initial stage 1 = no marked changes in emg or eog changes. Emergent stage 1 = rem (random eye movements) sleep (dream) and loss of muscle tone. Eeg activity of rem resembles wakefulness (paradoxical sleep) increased cerebral & autonomic activity. 80% of awakenings from rem led to dream recall vs. 7% of awakenings from non-rem sleep: dreams recalled from rem tended to be stories, dreams recalled from nrem tended to be isolated experiences.
