Neuroscience: A Chromatic Retinal Circuit Encodes Sunrise and Sunset for the Brain (Current Biology)

A new study reveals the retinal circuit for encoding the types of light prominent at sunrise and sunset. The output of that circuit is conveyed to the brain`s master circadian clock. Subconscious processing of sky color changes may therefore be the key stimulus for conveying morning and evening information to the circadian timing system in the brain.