Tetrachromacy is the condition of possessing four independent channels for conveying color information, in contrary to the normal three. People who experience Tetrachromacy are known as Tetrachromats and they possess four types of cone cells in the eye.  Their retina contains four types of higher-intensity light receptors with different absorption spectra.

Tetrachromacy is demonstrated among several species of birds, fish, amphibians, reptiles, insects and some mammals. In such organisms, the sensory color space is four-dimensional meaning they are able to process and identify different colors and their gradient.

Studies suggested that 2–3% of the world's women might have a fourth cone whose sensitivity peak is between the standard red and green cones, giving, theoretically, a significant increase in color differentiation.

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