As a participant in a classroom debate, a student has been asked to find support for the trichromatic theory of color vision. She would be advised to look at the research that shows there are three

a. types of rods, each sensitive to red, blue, and green.
b. types of cones, each sensitive to red, blue, and green.
c. retinal ganglion cells, each capable of responding to red, blue, green, but not their afterimages.
d. sections of the visual cortex which respond most directly to each of the colors red, blue, and green.

Answer: b. types of cones, each sensitive to red, blue, and green.