The opponent-process theory is most useful for explaining a characteristic of

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The opponent-process theory suggests that sensory receptors in the retina produce opposing neural responses to different wavelengths of light (e.g., red-green, blue-yellow). When one of these opposing signals is fatigued (such as by staring at a red object), the other signal is able to dominate, resulting in an afterimage of the complementary color (in this case, green). Therefore, the opponent-process theory is most useful for explaining afterimages.

The Opponent-Process Theory Is Most Useful for Explaining a Characteristic