June 4

This is a visual illusion that is “hot” on social networks, and it shows how easily our brains are tricked.


Despite the “creepy” nature of the image, this is a pretty interesting visual illusion.

In general, for a part of netizens, visual illusions have always been a favorite topic. Those are images that can show you how easily human senses and senses can be deceived, and no one is an exception.

Recently, Doctor Julie Smith – psychologist posted on TikTok personal video of such a visual illusion. And it has to do with negatives, like the one above.

At the beginning of the video, Dr. Smith says she can trick our brains into seeing a black and white photo as color. The video will now also be in black and white.

Dr. Julie Smith

But how to see the picture above in color? It’s another photo set as a negative. Try looking at the X on Smith’s forehead in the photo below very focused, do not blink for 30 – 45 seconds and then drag the image to the right, you will see the magic happen.

What phenomenon happened?

It’s called the Troxler effect – named after the scientist who discovered it. The cause of this phenomenon is the light-sensing receptors present in the retina. Normally, these cells receive light and convert it into signals that are sent to the brain. The brain analyzes the signal and then creates the image we see.

But when the eye is forced to stay still on one point, it means that the light signals the eye receives are the same. Over a period of time, the sensitivity to this signal weakens, forcing the brain to reduce the intensity of other signals to focus on processing. As a result, the surrounding images will gradually disappear.

And for those who don’t know, negative images are quite stimulating. When looking at it for a long time, the cone cells in the eye begin to lose their ability to perceive color, thereby sending weaker signals.

But to understand a little more, let’s come to color contrast theory. Accordingly, color perception is managed by an opposing mechanism, with 3 channels: blue against yellow; opposite red; white against black. Channels can combine with each other, producing colors such as cyan, yellow red (orange), but each channel only allows us to perceive only one color at a time. So you will never see greenish red at all.

Going back to the visual illusion above, because the negative has a green part, the cones will reduce their ability to perceive this color, sending out weaker signals. But when converted to black and white, the opposite receptor – red – emits a stronger signal. Without green, your brain will think you’re looking at red, when you’re not.

The same thing happens with the other colors in the negative. And in the end, you’ll see a full color image (for a short while), even though it’s actually black and white.


illusion, visual illusion

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