Psychology / Unit 3 Psych 0295 short lesson, about 20 seconds
The Suprachiasmatic Nucleus
Captions available
The idea
The suprachiasmatic nucleus, in the hypothalamus, is the brain's primary clock for circadian rhythms.
In practice
Light reaching the retina signals the suprachiasmatic nucleus, which shifts the timing of the daily cycle.
Where people slip
The clock is set by light, not by clocks. Evening light delays the cycle whether or not it comes from the sun.
Your place on the trail
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