PSY 102 Lecture 6: PSY 102 - Chapter 5
14 Mar 2017
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Document Summary
Biological rhythms: biological rhythms: periodic physiological fluctuations, annual, geese migrate, bear hibernate, 28 day female menstrual cycle, 24 hour, sleep, body temp, hunger, 90 min, sleep stages. Biological rhythms and sleep: circadian rhythms occur on a 24-hour cycle and include sleep and wakefulness. Termed ou(cid:396) (cid:862)(cid:271)iologi(cid:272)al (cid:272)lo(cid:272)k(cid:863), it can be altered by artificial light: light triggers the suprachiasmatic nucleus: governing biological clock to decrease (morning) melatonin from the pineal gland and increase (evening) it at nightfall. Suprachiasmatic nucleus (scn: light striking the retina signals the scn (part of our hypothalamus, scn transmits signals to pineal gland (alters production of melatonin, scn transmits signals to rest of body, side effects of melatonin: affects our dream, Environment & circadian rhythms: light bulbs, artificial light delays sleep, shift work, rotating shifts workers adapt better to progressively later shifts than to earlier ones, jet lag, spend the first day outdoors bright light in morning facilitates waking.
