PSYC 211 Lecture Notes - Lecture 12: Astrocyte, Data Parallelism, Electroencephalography
23 Oct 2017
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Sleep and biological rhythms: electrophysiological measurement of sleep. Sleep research is conducted in a sleep laboratory. Electrodes are attached to the subject(cid:859)s scalp to record electrical activity of the brain. Electrodes are also attached to the subject(cid:859)s chin to record muscle activity recorded as an electromyogram (emg). Electrodes placed around the eyes monitor eye movements recorded as an electrooculogram (eog). With all three, you can get an accurate representation of the stage of sleep that the person is in. Non-rem is separated into light sleep and deep slow-wave sleep. O there(cid:859)s the a(cid:449)ake state, light sleep (cid:894)stages (cid:1005) a(cid:374)d (cid:1006)(cid:895), deep slo(cid:449) -wave sleep (stages 3 and 4), and rem sleep. In rem sleep, emg flatlines which means all the muscles relax. The average person stays in deep sleep for a good hour-long portion. The(cid:374) the(cid:455) (cid:272)(cid:455)(cid:272)le (cid:271)a(cid:272)k up to lighter stages of sleep (cid:894)the(cid:455) do(cid:374)(cid:859)t (cid:449)ake up) Then it goes back up to deep sleep and back to rem.
