Psychology / Psych 0295 · Atom · ~20 seconds
The Suprachiasmatic Nucleus
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The suprachiasmatic nucleus, in the hypothalamus, is the brain's primary clock for circadian rhythms.
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Light reaching the retina signals the suprachiasmatic nucleus, which shifts the timing of the daily cycle.
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The clock is set by light, not by clocks. Evening light delays the cycle whether or not it comes from the sun.