New Study Suggests That Color Vision Evolved to Detect Blushing

A new study published in the journal Biology Letters suggests that color vision developed in primates in order to detect changes in skin tones. Researchers believe that color vision became vital for mating behavior and detecting fear responses.

Read more | All the better to see you blush, my dear... | Reuters

You can find more information color vision in these articles on the trichromatic theory of color vision and opponent-process theory of color vision.