Fig. 1 shows that patients and controls had comparable N1 amplitude. In the ANOVA of amplitudes in the N1 window, there was no significant group difference and no interactions involving group. The N2 potential is clearly evident in Fig. 1 for target and novel stimuli but not nontarget stimuli, which was reflected in a significant Stimulus effect (F = 21.79, df = 2,76, P<0.001, ε = 0.93). There was, however, no significant group difference in the N2 window and no Group by Stimulus interaction.
