PSY 102 Lecture Notes - Lecture 5: Psy, Thalamus, Anandamide
28 Apr 2016
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On your own: hallucinations, out-of-body experiences, near-death experiences, d j vu experiences, hypnosis. Circadian rhythms cyclical changes of alertness and sleepiness that occur on a roughly 24 hour basis. The suprachiasmatic nucleus (soo-pruh-kie-as-mat-ik), scn, reacts to light-dark patterns to activate the pineal gland, which starts and stops the secretion of the hormone melatonin. Sunlight is critical for resetting our circadian rhythms. Even an hour or two shift in sleep/wake patterns can disrupt circadian rhythms. Crossing time zones can also disrupt circadian rhythms, causing jet lag. Resetting your biological clock can take a few days. Light sleep lasting about 5 to 10 minutes. Relaxed, deep sleep characterized by irregular brain waves. Sleep spindles as the thalamus communicates with the cortex. K complexes occur only when we"re asleep and seem to react to external stimuli (loud noises). Heart rate slows, body temperature decreases, muscles relax, eye movements cease. Adults spend ~ 65% of sleep time in stage 2 sleep.
