Likewise, there were no significant effects involving group or condition for the auditory or visual P2 source, only significant hemisphere main effects for both modalities. An overall left-greater-than-right auditory P2 source at lateral frontocentral sites was comparable in both groups (cf. factor 210 in Figure 5C; simple hemisphere effects for controls, F(1, 38) = 6.68, p = .01; for patients, F(1, 38) = 3.91, p = .05). For visual stimuli, there was a significant right-greater-than-left P2 source at lateral occipital sites, which was largely due to a hemispheric asymmetry in patients, F(1, 38) = 9.86, p = .003, but not in controls, F(1, 38) = 1.47, p = .23 (cf. factor 195 in Figure 5D).5 Thus, the statistical analyses performed on early stimulus-locked CSD factors (N1 sink, P2 source) did not reveal prominent group or condition differences.
