The silent GIF shows what appears to be three pylons jumping rope. But the camera shakes just as the middle one lands, which some viewers believe they can hear or feel.
Dr. DeBruine, from the Institute of Neuroscience & Psychology at the University of Glasgow — according to The Telegraph — heard from more than 280,000 people by Tuesday, with a large majority saying they thought they heard a thudding sound.
“My gut says the camera shake is responsible for the entire effect,” said Twitter user Jeff Weiss. “Anything that shook the camera like that, would probably make the “thud” sound.”
Another user, Andrew Kemendo said, “The brain is “expecting/predicting” what is coming visually and then fires a version of what it expects across the relevant senses. Also explains why some might “feel” a physical shake.”