When a given bipolar cell increases its activity over its spontaneous rate, you see green. According to the opponent-process theory of color vision, when that cell decreases its activity below its spontaneous rate, you will see

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According to the opponent-process theory, the bipolar cell that responds to green light is paired with a bipolar cell that responds to red light. When one cell is activated, the other is inhibited. Therefore, if the green-sensitive bipolar cell decreases its activity below its spontaneous rate, the red-sensitive bipolar cell will increase in activity, resulting in the perception of red.

When a Given Bipolar Cell Increases Its Activity Over Its