Discussion
Consider the following statements about trichromacy and opponency.
1. Trichromacy describes the three cone types in the retina.
2. Opponency describes the encoding in the later visual pathway.
3. The two theories contradict one another and cannot both hold.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct, and statement 3 is the misconception the pair resolves. The two theories describe different stages: trichromacy the three cone types at the receptors, opponency the recoding of their outputs further along the pathway. They were long thought to be rivals, and the discovery that both are true at their own level settled the argument.
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