In addition to the eye itself, the brain’s interpretation of images could also serve as an indication of brain health. “The eye isn’t a camera,” says Alyssa Brewer, a neuroscientist at the University of California, Irvine. “The brain fills in all kinds of info based on prior experience and expectation about how things normally look.” This trick likely has an evolutionary purpose: It makes it much easier for us to quickly suss out our environment, and in particular to pick out faces.

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