Watch the following clip. Does Rocky the yellow jacket (the University of Rochester mascot) appear to be expanding? It’s actually completely still. Our brains perceive that outward motion because it’s in the opposite direction of the inward moving lines.
According to research by Duje Tadin and his colleagues from the University of Rochester and from McGill University, as little as 25 milliseconds will trigger this illusion, known as the motion aftereffect. Even after the most fleeting exposure to movement, neurons in the motion center of the brain respond to stationary objects as if they too were in motion.
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