A key feature of the colour-opponent system is sensory adaptation.

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Sensory adaptation is a key feature of the colour-opponent system, which is a neural mechanism responsible for the perception of color. This system includes three types of cone cells in the retina that are sensitive to different wavelengths of light and can be divided into two opponent channels: red-green and blue-yellow. When these channels are stimulated for a prolonged period, sensory adaptation occurs, which can result in reduced sensitivity and altered perceptions of color.

A Key Feature of the Colour-Opponent System Is Sensory Adaptation