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The test explains the variations in colors that different people see.Derval says the number of colors you see depends on the number and distribution of cones, or color receptors, in your eyes. Many creatures on the planet, tetrachromats, have four cells, which can allow some to see ultraviolet light. It goes like this in the context of a research study: Researchers present study participants with a set of two mixtures of colors that will look the same to trichromats but different to tetrachromats. In the context of a research study, researchers present participants with a set of two color combinations that will look similar to trichromats but differ from tetrachromats. Are You a Tetrachromat? Then you might be one of the rarest - reddit A: Looking at maternal male relatives is the best way to spot potential tetrachromats. How Do You Know If You Are Tetrachromatic? - Stellina Marfa What is tetrachromacy and how do I know if I've got it? | BBC Science Tetrachromacy is a condition in which an eye has four independent channels for transmitting color information or four types of cone cell. The test, which was posted just a few days after the Internet becameobsessedidentifying the color of a dress, asked viewers to count the number of colors in an image. After no results, he concluded that the fourth cone was not active. They have two normal cones and one faulty one that makes it hard to distinguish between red-green. These signals can then be combined in the brain into a total visual message. Talk:Tetrachromacy - Wikipedia For these organisms, the perceptual effect of any arbitrarily chosen light from its visible spectrum can be matched by a mixture of no less than four different pure spectral lights.