TETRACHROMATISM By N., Pam M.S. - April 29, 2013 noun. the theory postulating that typical color vision is based on interpretation of the four colors yellow, green, red, and blue. TETRACHROMATISM: "Tetrachromatism was proven in some of the trials, but not others." Related Psychology Terms TRICHROMATIC THEORY TRICHROMATISM ANOMALOUS DICHROMATISM OPPONENTS THEORY OF COLOR VISION XANTHOCYANOPSIA ANTAGONISTIC COLORS YOUNG-HELMHOLTZ THEORY OF COLOR VISION TETARTANOPIA RED-GREEN RESPONSES RAYLEIGH EQUATION Cite this page: N., Pam M.S., "TETRACHROMATISM," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/tetrachromatism/ (accessed June 2, 2020).