PSYC 3670 Chapter Notes - Chapter 10: Neuroglia, Lightdark, Chronobiology
18 Nov 2016
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By age 60, most humans have spent 20 years asleep. Leep is (cid:374)ot a passi(cid:448)e state of (cid:862)(cid:374)o(cid:374)(cid:449)aki(cid:374)g,(cid:863) (cid:271)ut rather the i(cid:374)terlo(cid:272)ki(cid:374)g of se(cid:448)eral different states with distinct patterns of brain activity. Biological rhythm: a regular fluctuation of any living process: circadian rhythm: a pattern of behavioral, biochemical, or physiological fluctuation that has a 24-hour period. This includes hormone levels, body temperature, and drug sensitivity: ultradian: referring to a rhythmic biological event with a period shorter than a day, usually from several minutes to several hours long. They are seen in behaviors as bouts of activity, feeding, and hormone release. Infradian: referring to a rhythmic biological event with a period longer than a day. A familiar infradian rhythm is the 28-day human menstrual cycle. Humans and many other primates are diurnal active during the day. Most other mammals, including most rodents, are nocturnal active during dark periods. Animals achieve this regularity using only a built-in biological clock.
