PS262 Chapter Notes - Chapter 8: Reticular Formation, Sleep Paralysis, Zeitgeber

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27 Feb 2018
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Jet lag: crossing time zones causes a disruption of circadian, most people find it easire going west than east because youre staying awake later but waking later. Imparied concentration, depression, sleeplessness called a "phase-delay: going east causes a phase advance and your have to wake earlier. Jet lag causes stress which releases cortisol which messes up memory and hippocampus. Shift work: working at night with lights on is only moderately changes the circadian rhythms, bluish lights are good at resetting the rhythm. Morning people and evening people: middle of sleep peak at 20 years old, thus it depends partly on age, but also genetics and social factors. In the hypothalamus, above the optic chiasm: controls circadian rhythms in a genetically controlled manner, mutation in hamster scn gene causes it to be 20 hrs instead of 24hrs, how light resets the scn. Small branch of the optic nerve known as retinohypthalamic path from the retina to the scn alters the.

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