Tech & Science: How the Brain Reacts to Optical Illusions - PressFrom - United Kingdom
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Tech & ScienceHow the Brain Reacts to Optical Illusions

08:30  19 february  2019
08:30  19 february  2019 Source:   newsweek.com

How the Brain Reacts to Optical Illusions

How the Brain Reacts to Optical Illusions Scientists investigated how the brain processes the Pinna-Brelstaff motion illusion.

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An optical illusion (also called a visual illusion ) is an illusion caused by the visual system and characterized by a visual percept that (loosely said) appears to differ from reality. Illusions come in a wide variety

How the Brain Reacts to Optical Illusions © Getty Images Scientists have studied a famous optical illusion to gain an understanding of how our brains process reality.

The research published in the journal JNeurosci centered around the Pinna-Brelstaff motion illusion: a series of thick lines arranged in concentric circles that appear to rotate when the viewer moves their head back and forth.

The scientists tested how parts of the brain that help us pick up on motion perception combine both real and illusory visual information to create the impression the image is moving. This enabled them to find cells that appear to process the illusion similarly to a moving object. Monkeys also appear to experience the illusion in this way.

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Optical illusions occur because our brain is trying to interpret what we see and make sense of the world around us. Try out some of these illusions and discover just how tricky it can be for your brain to accurately interpret the images from your eyes.

Visual illusions show us that we do not have direct access to reality. They can also provide an inkling of the mental processing that delivers our experience of Indeed, it is the processing happening inside our brains that is the basis for many illusions . Rather than delivering information from our eyes in

For the study, nine human subjects (seven male and two female) ages 22 to 30 were recruited. They were presented with a series of Pinna-Brelstaff motion illusions. Two rhesus monkeys, trained to spot the difference between a version of the Pinna-Brelstaff illusion that didn’t move and those that appeared to move, were also tested. Previously, the researchers used fMRI brain imaging equipment to identify the part of the brain that makes the image appear as if it is rotating.

This time, they found a processing gap of around 15 milliseconds by neurons in the medial superior temporal area, which are critical for picking up visual motion, helped to make the still image come to life.

Dr. Ian Max Andolina at the Institute of Neuroscience, Chinese Academy of Sciences, China, told Newsweek: “Navigating through the world requires our brain to be able to compute the direction in which we are heading; this is critical for day-to-day life. To do this, motion information has to be combined from every point in the space around us and processed efficiently. But how this occurs is not very well understood.

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Things are not at all as they seem What are the different types of optical illusions and why are our eyes tricking us? How The Human Eye Evolved To Be So

The best optical illusions challenge our perception of reality: What seems true at the moment turns out to be false. Its interesting finding out why these illusions work and how the brain reacts to them. It actually down to how the brain makes many assumptions about what it see. rather than just relying

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“Our study utilized a celebrated illusion to study how this information is combined by the brain. The Pinna illusion carefully introduces local biases, and unlike other illusions these can be well controlled.”

He continued: "We can now say that monkeys not only perceive illusions as we do, but with a similar subjective magnitude. As primates (human and macaque), we are filled with unconscious biases, and visual illusions are a particularly visceral example of this. We have shown in the best detail yet within the circuits and cells that build our brain, how parts of this process occurs.”

In the future, they hope to pinpoint the part of the brain that produces the final perception, Andolina said.

However, that likely won't be in the near future, he said: “With current technologies we cannot yet solve this ultimate mystery, as it requires monitoring neural activity across the whole brain with very high spatial and temporal precision.”

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How is a rainbow formed? These optical illusions require a mix of the right weather, eye direction, and luck.ot of gold.

Learn more about how this optical illusion works. An oldie but goodie. Your brain thinks there’s a black circle inside each white one—until you focus on that white circle. Then you realize it was never there at all.

Most optical illusions take advantage of how our eyes and brain process visual information to trick us into seeing, or not seeing, certain patterns or images. For the most part, your brain filters this way in order to process information as quickly as possible (so you can react ) and so you don’t become

This is the latest study to investigate the differences between reality and how we perceive it. Last year, scientists found that imagining an object while you hear a sound can change how you go on to perceive that sound. The research into the ventriloquist illusion was published in the journal Psychological Science.

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