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![Before light reaches these rods and cones in the retina, it passes through some specialized cells that send signals to brain areas that affect whether you feel happy or sad.](https://woub.org/wp-content/uploads/2018/12/gettyimages-128601129-da84b5e0a45a8f2c04041c5a9999ec2bc1888bae-e1545410268119-900x422.jpg)
Scientists Find A Brain Circuit That Could Explain Seasonal Depression
By: Jon Hamilton | NPR
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Research suggests the winter blues are triggered by specialized light-sensing cells in the retina that communicate directly with brain areas involved in mood.