A person who has 4 types of color receptors is called ...
Such people do not exist
Man is usually sensitive to about 500,000 colors. Tetrachromacy is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cells in the eye. Organisms with tetrachromacy are called tetrachromats which can see up to 99 million shades.
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+3 Very interesting! globalquiz.org
+1 Very interesting! olorion
+1 Very interesting! Ninjai