The latencies and amplitudes of the P3a and P3b components were extracted from the electrode site at which the spatial maxima occurred for each subject. Table 4 shows these data. There were no significant main or interaction effects with regard to P3a or P3b latency. There were also no significant main effects of group, or group by gender interaction effects, for P3a or P3b amplitude. There was, however, a significant main effect of gender for both P3a and P3b amplitude, F(1, 95) = 5.175, p = .025, and F(1, 100) = 4.819, p = .030, respectively, with boys having larger amplitudes than girls in both cases.
