The opponent process theory is a psychological and physiological model that explains how humans perceive color and emotional responses. This theory has two main contexts: one related to color vision and the other to emotions. ### Color Vision In the context of color vision, the opponent process theory was developed by the psychologist Ewald Hering in the late 19th century. It posits that our perception of color is controlled by three opposing pairs of colors: 1. **Red vs. Green** 2.
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