The "scintillating starburst" stimulus (IMAGE) New York University Caption This stimulus is made up of several concentric pairs of scaled star polygons. Most observers perceive fleeting rays, beams, or lines emanating from the center that appear to be brighter than the background. Credit Courtesy of Michael Karlovich, Recursia LLC Usage Restrictions In conjunction with this study only 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.