"To try it yourself, first focus your eyes on the cross between the photos of Liv Tyler and Tom Cruise. Keep the photos in your peripheral vision, but stay focused on the cross. The images will begin to change, first to snaps of Kevin Spacey and Patrick Stewart, and then to Jennifer Lopez and Drew Barrymore. After a few seconds, something very strange will happen - the faces will start to look disfigured, as if their features are out of proportion."
"The illusion has garnered huge attention on TikTok, with many users flabbergasted by the effect. 'What in heaven's name is my brain doing without my permission!!' one particularly disturbed user asked in the comments. The flashed face distortion effect is a well-known illusion in which normal human faces are distorted when they flash in the periphery. 'What's actually happening is your brain is holding on to previous images, and overlaying those on new ones as they appear in your peripheral vision,' Mr Firman explained."
An optical illusion called the flashed-face distortion effect makes ordinary celebrity faces appear grotesquely distorted when viewed in peripheral vision while fixating on a central point. The sequence involves focusing on a cross between two photos (for example Liv Tyler and Tom Cruise) while other celebrity photos ripple through the periphery (Kevin Spacey, Patrick Stewart, Jennifer Lopez, Drew Barrymore). After several flashes, facial features seem out of proportion because the brain holds onto previous images and overlays them onto new ones, filling in missing detail when faces are not directly viewed. Thousands of viewers reacted online, many rechecking original images to confirm authenticity.
Read at Mail Online
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