Tetrachromacy
= Tetrachromacy
<Color vision> using four functionally independent spectral channels. Four pigment variants or four potential <cone cell> types do not alone demonstrate four-dimensional behavioral discrimination. Tests must establish information use beyond the matches available to a specified trichromat.<The dimensionality of color vision in carriers of anomalous trichromacy by Gabriele Jordan and others>[Behavioral tests and molecular analysis, J Vis 10(8):12]{ref}