This is a demonstration of silencing, described in: Suchow, J.W., & Alvarez, G.A. (2011). Motion silences awareness of visual change. Current Biology. doi:10.1016/j.cub.2010.12.019 Instructions: Keep your eyes fixed on the small white mark in the center. At first, the ring is stationary and it's easy to tell that the dots are changing. A few seconds later, the ring begins to rotate and the dot