According to the integrated explanation of color vision:

Question

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The integrated explanation of color vision suggests that both the opponent-process theory and the trichromatic theory explain color vision at different levels of visual processing. The trichromatic theory operates at the level of the retina, while the opponent-process theory operates at the level of the visual pathway beyond the retina, such as in the thalamus or visual cortex. Therefore, both theories contribute to our understanding of color vision.

According to the Integrated Explanation of Color Vision