Optical Illusion (VIDEO) University of Rochester This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Scientists have figured out the brain mechanism that makes this optical illusion work. The illusion, known as "motion aftereffect" in scientific circles, causes us to see movement where none exist Credit University of Rochester Usage Restrictions Please Insert Credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.