PSY 202 Lecture Notes - Lecture 5: Suprachiasmatic Nucleus, Sleep Spindle, Freerunning
Document Summary
Plants keep identical rhythms in nature and in isolation. > weitzman & czeisler (mid-1970s): isolated unused hospital wing. > twenty 24hr days to start, then no routine the experimenters shut of lights at 12am and woke them up at. Infradian - cycle is less than once a day: menstrual cycle, hibernation. Ultradian - cycle is more than once a day: heartbeat, breathing. Sunday: try to sleep during your regular sleep schedule but your biological clock wants you to sleep at 4am. Stage 1 - falling asleep: sudden, not gradual (dement, 1974) lasts about 10 minutes o: drifting thoughts, slow rolling of eyes, sleep spindles (k complexes) don"t appear in awake-ness. Stage 2 lasts about 20 min o: more synchronized (more neurons are iring in sync - broader waves, eeg responses to noise. Stages 3-4 lasts about an hr o: extreme synchronization.
