Seriously now, that claim is truly grade-1 gold-plated nonsense … It is therefore impossible for an online test to investigate tetrachromacy.”Įven more absurd is that the online test I linked to claims that as many as 25% are tetrachromatic. “Unfortunately, computer screens do not provide enough colour information to be able to ‘tap into’ the extra dimension that tetrachromats may possess. The majority of those people, however, actually don’t see an unusually high number of colors.Īccording to the researchers at New Castle University’s Tetrachromacy Project, standard RGB (i.e., red-green-blue) computer monitors are not capable of displaying the range of colors required to create a reliable online test for tetrachromacy: Thousands of people took the test and proudly shared the news that they were a tetrachromat on Facebook and Twitter. Those who spotted more than 32 colorswere informed that they had a unique fourth cone and were therefore tetrachromats: The amount of colors perceived supposedly indicated the number of cones the viewer possessed. The test, which was posted just a few days after the Internet became obsessed identifying the color of a dress, asked viewers to count the number of colors in an image. Origins: On 28 February 2015, a fake online test for Tetrachromacy (a rare condition of having four cone cells in the eye) went viral on the social media site LinkedIn. Snopes has already debunked the above test … What can we conclude, that perhaps everybody I know is tetrachromatic, or that the test is seriously flawed. That appears to be true for almost anybody who does the above test. If your bullshit alarm has not yet tripped, then permit me to tip it over the edge for you.Īpparently, via the above test, I’m tetrachromatic. Between 34 and 39 colours: Wow! You have tetrachromatic vision.Between 20 and 33 colours: You have trichromatic vision.This means that you have only two types of cone cells Less than 20 colours: You’re a dichromat.Using the number of variations you get is supposed to tell you what you are. Count the number of colours and shades you can see in the spectrum: Now here is a fun little test to find out. But, and this is the surprising thing, some humans have four and so can potentially see a lot more. Our early non-human ancestors are thought to have had four and so as evolution happened, we lost two and gained one. Tetrachromatic vision is something that is found in several species of birds, fish, amphibians, reptiles, insects, some mammals, and also apparently in some humans. What is truly fascinating is that not everybody has just three variations of cone receptors, some have four and are tetrachromatic. A word used to describe this is “ trichromatic“. It is these three variations that enables you to perceive colours. Most humans have three different cone cells within their eyes.
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