Find the rat in the photo in three seconds to see how observant you are!  

the English word "illusion" comes from this root. 

When we look at the world, our brains fill in the blanks with information that our eyes don't capture.  

Everyone can see it.  

One of the easiest ways to gauge a person's level of focus 

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is to show them an optical illusion picture. These pictures are intentionally misleading. 

Researchers in the field of neuroscience have also studied  

the brain's reality perception using images of optical illusions. 

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