PSYC 3250 Chapter 14: Chapter 14: Sleep Dream and Circadian rhythms

• School: Memorial University
• Department: Psychology
• Course: PSYC 3250
• Professor: susanwalling

Document Summary

Discovered in 1950s that rapid eye movements (remss) occur under the closed eyelids of sleepers during these periods of low-voltage, fast eeg activity. Berger and oswald discovered that there is also a los of electromyographic activity in the neck muscles during the same sleep periods. Electroencephalogram (eeg), electrooculogram (eog), electromyogram (emg) = three standard psychophysiological bases for defining stages of sleep. First-time phenomenon: the disturbance of sleep observed during the first night in a sleep laboratory. After the eyes are shut and a person prepares to go to sleep, alpha waves waxing and waning bursts of 8- to 12-hz eeg waves begin to punctuate the low-voltage, high frequency waves of alert wakefulness. As a person falls asleep, there is a sudden transition to a period of stage 1 sleep eeg. Stage-1 sleep eeg: low-voltage, high-frequency signal that is similar to, but slower than, that of alert wakefulness.