According to the trichromatic (Young-Helmholtz) theory, what causes perception of green?
a. The activity of cones is greatest at a point between the fovea and the periphery.
b. Most of the cones are firing at an intermediate frequency
c. The medium-wavelength cones are more active than the other ones.
d. The velocity of action potentials from the retina is at an intermediate level.
Answer: c. The medium-wavelength cones are more active than the other ones.
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