Quotation from: General Science

Written by: Bertha M. Clark


135. Color Blindness. The nerve fibers of the eye which carry the
sensation of color to the brain are particularly sensitive to the
primary colors--red, green, blue. Indeed, all color sensations are
produced by the stimulation of three sets of nerves which are
sensitive to the primary colors. If one sees purple, it is because the
optic nerves sensitive to red and blue (purple equals red plus blue)
have carried their separate messages to the brain, and the blending of
the two distinct messages in the brain has given the sensation of
purple. If a red rose is seen, it is because the optic nerves
sensitive to red have been stimulated and have carried the message to
the brain.

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