PSY 302 Lecture 8: Biopsychology 10:6:16

• School: University of Arizona
• Department: Psychology Main
• Course: PSY 302
• Professor: Jean- Marc Fellous

Document Summary

Sleep: absence of overt behavior, absence of consciousness. Sleep has different stages characterized by different eeg waveforms (frequency content) Stage 1: little less of high and more low frequency. Slow wave sleep in stage 3 and 4. Rem sleep: rapid eye movement, looks similar to awake state. Stage 1: drowsiness, heavy eyes, lasts about 10 min, theta oscillations. Stage 2: sensory disconnection, sleep spindles and k complexes, lasts about 15 min, thalamus prevents sensory information, see irregularities in eeg. Stage 3/4: loss of consciousness, lasts about 60 min, aka slow wave sleep, delta frequency. Rem: dreaming, loss of muscle tonus, rapid eye movements, activity in sexual organs, desynchronized, lasts about 25 min, aka paradoxical sleep, theta and beta frequency, weird because beta is active thinking, why sometimes called paradoxical sleep. During slow wave sleep, neurons undergo up and down states: periods of activity/silence, 1 period/second. Sleep is a cycle: free running sleep/wake cycle.