True or False: The small brain area that is important for regulating sleep/wake cycles through retinal input is called the SCN.
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Answer: True. The small brain area that is critical for regulating sleep/wake cycles through retinal input is called the SCN, which stands for the suprachiasmatic nucleus. It is located in the hypothalamus, just above the optic chiasm. The SCN receives direct input from the retina of the eye, which allows it to synchronize the body’s circadian rhythms with the external light-dark cycle.