Demonstration of peripheral visual fading, or Troxler effect. Fixate precisely on the red spot, while paying attention to the bluish annulus. After a few seconds, the annulus will disappear, and the red spot will appear to be surrounded by a completely white field. Eye movement immediately brings the blue annulus back to perception. From MartinezConde S, Macknik SL, Hubel DH: The role of fixational eye movements in visual perception. Nat Rev Neurosci 5:229-240, 2004. Courtesy of Susana Martinez-Conde, PhD.