Table 1 shows the results of MANOVA analyses applied to the ERP amplitudes measures. The results show that only P200 (F(5,79) = .139, p = .035) and P3b (F(5,90) = .195, p = .001) amplitudes discriminate the groups. However, Box’s test on the P200 amplitude measures indicated that the covariance matrices differed significantly between groups (p = 0.003), complicating the group comparison on this difference. LTAAs had reduced P3b amplitudes at Pz and CPz, with the group effect accounting for 8.5% and 4.8% of the variance, respectively. The discriminant analysis support the separate contributions of P3b at Pz and CPz in discriminating the groups
