PSYCH 100 Lecture Notes - Lecture 10: Seasonal Affective Disorder, Circadian Rhythm, Jet Lag
14 Dec 2018
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Document Summary
Our awareness of ourselves and our environment. Regular, periodic physiological uctuations: annual cycles (seasonal affective disorder - s. a. d. , 28-day cycles - female menstrual cycle, daily 24-hour sleep cycles, 90-minute sleep cycles. Regulated by the saprachicsmatic nucleus (scn) in the brain. Regular bodily rhythms that occur on a 24-hour cycle. Can be disrupted by: jet lag, nightwork, daily sleep schedule, body temperature. Circadian rhythms are biological rhythms, but they are a more speci c subset limited to daily cycles. Depending on how conscious one is, the brain generates waves of activity at varying frequencies that are observable via eeg. Gamma waves & beta waves generated during wakefulness when engaging in complex higher level mental processes. Theta waves generated during times of extreme calm and/or light sleep. Relaxed and resting (awake)- alpha waves: stage 1. Lasts about ve minutes at the beginning and ve minutes at the end of sleep.
