Sensation and Perception 9th Edition by Bruce Goldstein

Exercise 2

When we discussed color deficiency, we noted the difficulty in determining the nature of a color-deficient person's color experience. Discuss how this is related to the idea that color experience is a creation of our nervous system.
Figure Ishihara plate for testing color deficiency. (a) A person with normal color vision sees a "74" when the plate is viewed under standardized illumination. (b) Ishihara plate as perceived by a person with a form of red-green color deficiency.