An afterimage is a visual sensation that persists after the original stimulus has been removed. A common example is seeing a spot of light after briefly looking at the sun and then turning away. When the stimulus involves color, the opponent-process theory explains the occurrence of a negative afterimage, where one perceives the opposing color from the pair (e.g., seeing green after staring at red).

Afterimage

Based on the principle that color vision operates through opposing pairs (such as red-green and blue-yellow), explain the visual experience described in the scenario below.

Explaining a Visual Phenomenon

The opponent-process theory has two key implications for color perception. First, because certain colors inhibit each other within the same neural channel, we cannot perceive impossible color combinations like 'greenish-red' or 'yellowish-blue'. Second, this opponent processing mechanism is responsible for the phenomenon of negative afterimages.

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The opponent-process theory asserts that color is processed in opponent pairs: black-white, yellow-blue, and green-red. According to this model, specific cells in the visual system are excited by one color in a pair and inhibited by the other. This theory is particularly useful for explaining visual phenomena such as the negative afterimage.

Opponent-Process Theory

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Implications of Opponent-Process Theory

The trichromatic and opponent-process theories of color vision are not mutually exclusive; instead, they describe color processing at different stages within the nervous system. The trichromatic theory accurately explains visual processing at the retinal level, where three types of cone cells respond to different wavelengths of light corresponding to red, green, and blue. Once the visual signal is transmitted beyond the retina towards the brain, the neural cells process this information in a manner consistent with the opponent-process theory.

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