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Surround suppression is altered in patients with focal nongeneralizing seizures, but is not affected by seizure frequency. (A) Box plot of SSIs for the subjects grouped by seizure type. The box limits represent the first/third quartiles, with the median indicated by the middle line and the whiskers extending to data points that are <1.5 interquartile range beyond the box. The data for the group with focal seizures without generalization (red) were highly significantly different from all other groups (**P < 0.01). (B) Regression of SSI with respect to age for the same groups of subjects. SSI, surround suppression index.