Which is NOT an opponent-process cell system?

Name: Which is NOT an opponent-process cell system?
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Question

Quizplus · Accepted Answer

The opponent-process theory suggests that our visual system is made up of pairs of opponent colors, in which one color is perceived as inhibiting the other. Red and green, blue and yellow, and black and white are all pairs of opponent colors. Orange and violet are not part of an opponent cell system.

Which Is NOT an Opponent-Process Cell System