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The averaged visual evoked responses (AVER), the dispersion pattern (DP) resulting from their variability at each time point locked to the stimulus onset (D=f(t)), were studied in epileptics in comparison with controls of the same age range. In epileptics the AVERs, especially the last components, were higher in amplitude than in controls. The DPs were also generally ampler than in controls; in epileptic patients without mental disorders the pattern of DP was as in normals, except that the third period was higher than the first one, while in epileptics with interictal mental disorders the second period disappeared, and the peak of the DP occurred at the middle third or at the end of the period analysed.