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Young-Helmholtz theory of color vision

[ -hĕlmhōlts ]
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n.
The theory that there are three sets of color-perceiving elements in the retina, red, green, and violet. Perception of the other colors arises from the combined stimulation of these elements.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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