While the trichromatic theory of color perception was first formulated in the 1800's; research in 1960s suggested that there were ________ kinds of cones and that each was sensitive to either ________.

Question

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Research in the 1960s suggested that there were three kinds of cones and that each was sensitive to either red, green or blue. This supports the trichromatic theory of color perception.

While the Trichromatic Theory of Color Perception Was First Formulated