The trichromatic and opponent process theories of color vision are not in conflict because each corresponds to:
A) a different portion of the spectrum.
B) the opposite half of perceivable colors.
C) one type of color blindness.
D) a different stage of visual processing.
Answer: D
Rationale: The trichromatic theory explains how color is detected at the level of the cones. The opponent-process theory explains the activity of specialized neurons that transmit messages via the optic nerve to the brain. Both the trichromatic and opponent-process theories are correct—they are both required to explain how we see color.
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