Opponent Process - Complementary-color Afterimages

Complementary-color Afterimages

If we stare at a red square for forty seconds, and immediately look at a white sheet of paper we'll often perceive a green square on the blank sheet. This complementary color afterimage is more easily explained by the opponent theory than the trichromatic; in the opponent-process theory, fatigue of pathways promoting red produce the illusion of a green square.