The theory that emphasizes the role of ganglion cells in afterimages and explains certain types of colour blindness is a modified version of the _______________ theory.

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The opponent-process theory, which emphasizes the role of ganglion cells in afterimages and explains certain types of color blindness, is a modified version of the trichromatic theory. It suggests that color perception is controlled by the activity of two opponent systems: a blue-yellow mechanism and a red-green mechanism.

The Theory That Emphasizes the Role of Ganglion Cells in Afterimages