Definition: According to the Young-Helmholtz theory of color vision, there are three receptors in the retina that are responsible for the perception of color. One receptor is sensitive to the color green, another to the color blue, and a third to the color red. These three colors can then be combined to form any visible color in the spectrum.
Young-Helmholtz Trichromatic Theory of Color Vision
By Kendra Van Wagner, About.com
More About Trichromatic Color Vision
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