The trichromatic theory of color vision states that, in addition to black and white, there are four basic colors, which are divided into two pairs of color-sensitive neurons: red-green and blue-yellow.

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The trichromatic theory of color vision states that there are three types of color receptors (cones) in the eye, each sensitive to red, green, or blue light. The opponent-process theory, not the trichromatic theory, involves pairs of color-sensitive neurons such as red-green and blue-yellow.

The Trichromatic Theory of Color Vision States That, in Addition