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Optical illusion leads to a delay in the brain



  • This optical illusion, called the Pinna-Brelstaff illusion, reveals a delay in our brain.
  • If you focus on the center point and move your head forward, the outer circle appears to rotate clockwise – move your head back and the movement changes.
  • A study by the Chinese Academy of Sciences in Shanghai showed that monkey brains had a delay of 15 milliseconds when processing motions.

The human brain is a wondrous thing, but definitely not perfect, as this brain-breaking optical illusion proves.

In a study conducted by scientists at the Chinese Academy of Sciences, these scientists have proven that the brain experiences a delay in viewing some optical illusions, including the Pinna-Brelstaff illusion.

Even if it looks like two circles surrounding a point, look a little closer. Focus on the point first. Then start with your head closer ̵

1; the circles should rotate! Now slowly move your head back to normal. The circles just turn the direction and turn in the other direction.

This illusion has been around for years, but it was never clear what caused it.

"It's like you're at a party listening to a voice under a lot of noise," said Ian Max Andolina of the Chinese Academy of Sciences to New Scientist. "The physical movement is like background noise and the illusion is the voice in the sound you need to pick out, it takes a little longer to do that."

Read more: In this optical illusion an animal hides, but you have to shake your head to see it.

The study used macaques (a type of monkey that urged them to perceive an illusory movement similar to humans) to show that there is a tiny, but significant delay between the neurons in brains, the movements that is, the circles that move and neurons that sense local motion. The local motor neurons recognize that nothing is moving, but they need a few strokes to catch our eyes.

What do you see?
Wikimedia Commons

How long will it take for to find out your brain?


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