PSY100Y5 Lecture Notes - Lecture 5: Alpha Wave, Hashish, Electrodermal Activity
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PSY100Y5 Full Course Notes
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Sleep initially thought as people"s individual experiences and not the serious subject of a biomedical investigation. Sleep has a critical impact on many important processes and tasks: variations of conscious are shaped in part by biological rhythms, biological rhythms are periodic fluctuations in physiological functioning. Suprachiasmatic nucleus located in the hypothalamus, sends signals to the nearby pineal gland who secrets melatonin plays a key role in adjusting biological clocks. Ignoring circadian rhythms: when the biological clock is ignored, the quality of sleep suffers. Falling asleep is a gradual process and there no obvious transition between wakefulness and sleep: the length of sleep varies considerably for everyone, depends on a variety of factors (noise, light, caffeine, etc. ) Stage 2 (10-25 minutes) brief bursts of higher frequency brain waves called sleep spindles appear. Brain waves become higher in amplitude and slower in frequency turning into a slow- wave sleep.