Social perception of facial color appearance for human trichromatic versus dichromatic color vision
Thorstenson, C. A., Pazda, A. D., & Elliot, A. J. (2020)
Personality and Social Psychology Bulletin
Humans' typical color vision is trichromatic, because our eyes have 3 distinct light-sensitive receptors, called cones. Scholars have suggested that we evolved trichromacy in order to distinguish important types of objects, from foods to faces. We found evidence that trichromacy is particularly important for distinguishing social states (emotion, healthiness, attractiveness) from faces.