PSYCH 133 Lecture Notes - Lecture 7: Hypothalamus, Visual Cortex, Ontogeny
Document Summary
Study lectures and sections, not optional readings. How you yourself can tell you are sleeping. Nrem sleep: 4 sub-stages (nrem 1-4) in humans. 90 min nrem rem cycle (humans) First half of night - majority is deep nrem sleep. Second half of night - majority if rem sleep. More deep nrem (sws) early, more rem late. Sleep appears to be present in all species studied. Suggests that sleep is a fundamental necessity for all living organisms (active/passive states even seen in bacteria!) Control at will own metabolic rate in demand to an environment. Humans: sleep behavior" is very diverse, but in non-industrialized ancient cultures, it appears to be a social activity, with no defined waking times, and with the possibility of a biphasic cycle (long at night, short nap during day) Sleep - controlled by very specific neurobiology e. g. changes in neurochemistry, neurophysiology and functional anatomy. Neurochemical: awake, nrem and rem involve changes in three neuromodulators --
