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How many colors are in this image? The photo that divides Twitter

Something has the challenges that play with our senses that we love. If not, let them tell it to our viral riddles, or to the famous photo of the dress that became popular around the world because people couldn’t agree on whether it was white and yellow (no) or blue and black (correct) . We can only trust our senses to understand the world, and sometimes not even.

Although the coronavirus is still present in our lives, social networks sometimes allow us to take a break from the day to day and distract ourselves a little with small trifles. Or maybe not so small, Well, a bloody battle has been going on over a photo with which users do not seem to agree: how many colors do you see in this photo?

Three? Eleven? Seventeen? There seems to be no solid opinion. Most likely, the phenomenon has to do with something that you already explained in your dwas the Austrian physicist Ernst Mach, as indicated ‘Science Alert’. While working as a professor of mathematics and physics at the University of Graz in the 1860s, he developed a deep interest in optics and acoustics.

In 1865 he became interested in an illusion similar to the one that we all wonder nowSimilar colors of slightly contrasting hues that become easily distinguishable when touched, but more difficult to distinguish when separated. Mach understood that something strange was happening inside the eyeball, specifically within the photosensitive tissue that makes up the retina. And he was right, this little trick our eyes put on us is known as lateral inhibition.

If we imagine two cells sending two very similar colored signals to the brain, the brain will assume they are the same shade (because it loves shortcuts)

Think of your retina as like a movie screen capturing the light projected through the pupil. This screen is covered in receptors, some of which will react better under brighter light and send a barrage of signals to the brain. If we imagine two cells sending two signals of very similar colors to the brain, it will assume that they are the same shade (because our brain loves shortcuts and simplicity, it does not have time to divide such similar colors).

Viral riddle: can you find the different animal pair?

ACyV

The retinal cells of the eye that receive a greater stimulus inhibit (hence the lateral inhibition) the surrounding cells to a greater degree than the cells that receive less intense stimulation. Light receivers that receive information from the lighter side by the edges of the images produce a stronger visual response than those that receive information from the darker area or side. What is it for? This improves contrast by making the edges more pronounced.

Lateral inhibition does not explain why some of us see more colors than others, perhaps we experience it to varying degrees or it has to do with our monitors and screens.

While lateral inhibition explains why our eyes are better able to differentiate similar shades when they are next to each other, it does not explain why some of us see more colors than others, as in the example above. The brightness of our screens and monitors may also have something to do with the process, or that each of us experience it to varying degrees. Be that as it may, it helps us at least have fun with visual games and puzzles on Twitter, which is always a great way to pass the time.

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