PSY 22200 Study Guide - Midterm Guide: Circadian Rhythm, Jet Lag, Zeitgeber
Document Summary
Jet lag- disruption of circadian rhythms due to crossing time zones: sleepiness during the day, sleeplessness at night, depression, and impaired concentration, mismatch between internal circadian and external time, phase-delay: going west. Able to sleep later: phase-advance: going east. Low concentrations in the morning and high at night: melatonin, released by the pineal gland. Influences circadian and circannual rhythms: pineal gland tumors: can stay awake for days at a time, released 2-3 hours before bedtime. Irregular, low-voltage fast eeg waves: stage 1 > 2 > 3 > 4 > 3 > 2 > rem and repeat. Why dreams: predators a(cid:374)d a(cid:374)i(cid:373)als that (cid:449)o(cid:374)"t get atta(cid:272)ked duri(cid:374)g sleep, sleep (cid:449)ell, leep i(cid:373)pro(cid:448)es (cid:373)e(cid:373)or(cid:455) (cid:271)(cid:455) (cid:449)eake(cid:374)i(cid:374)g s(cid:455)(cid:374)apses that (cid:449)ere(cid:374)"t stre(cid:374)gthe(cid:374)ed duri(cid:374)g the da(cid:455). Thirst: mechanisms of water regulation, gerbils can survive with little water, pituitary releases vasopressin (antidiuretic hormone (adh), raises blood pressure by constricting blood vessels, osmotic thirst.
