Light Switches Brain Signaling: Longer Days Bring "Winter Blues" for Rats, University of California, San Diego (UCSD) Study

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Most of us are familiar with the "winter blues," the depression-like symptoms known as "seasonal affective disorder," or SAD, that occurs when the shorter days of winter limit our exposure to natural light and make us more lethargic, irritable and anxious. But for rats it's just the opposite.

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