Longer Days Make Rats Sad - Presented by: The Aol. On Network

Seasonal Affective Disorder, known as SAD, is a kind of depression that causes mood changes in humans when the days get shorter in the winter. For nocturnal rats, shorter days with less light have the opposite effect. Neuroscientists from the University of California in San Diego found that the brain cells of rats produce more dopamine when the days are shorter, which makes them feel less anxiety.



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