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Altered psychophysical measure of surround inhibition in patients with epilepsy. (A–D) Threshold durations for discriminating the direction of movement, for large (5° field of view) and small (0.7°) gratings, at high (92%) and low contrast (2.8%), in the control and epilepsy cohorts, plotted against age of subject. The error bars for the individual data points indicate the 95% confidence interval for each, as described in our previous paper (Yazdani et al. 2015). (E) The motion surround suppression index for the control and epilepsy cohorts plotted against age of subject.