Figure 1. Task and performance.

(A) The shape extraction task was performed under the complex condition with a large grating background (left panel) and the simple condition with a uniform gray background (right panel). The task had a 3-second fixation period and a 12-second block of stimulus period. During the stimulus period, participants were instructed to push the response button as soon as they saw a change in arrow direction. (B) The control and dyslexic groups performed similarly on the shape extraction task. The left panel shows that, for both groups, response accuracy was significantly lower for the complex condition than for the simple condition. The right panel shows that the percent of delayed, but correct, responses was significantly greater for the complex condition than for the simple condition. * p<0.01, ** p<0.005. Error bars indicate SEM within group.