Robust overall auditory old/new effects were also observed for P3 source over lateral parietal sites (Figure 6A; Table 3A). However, a significant group × condition interaction revealed that the old-greater-than-new P3 source was only significant in controls, F(1, 38) = 38.8, p < .0001, but not in patients, F(1, 38) = 1.18, p = .28. Moreover, patients had overall reduced auditory P3 source compared to controls. Although auditory P3 source was overall strongly left-lateralized, a significant simple hemisphere effect was only observed for controls, F(1, 38) = 9.94, p = .003, but not patients, F(1, 38) = 1.92, p = .17. Thus, patients showed markedly reduced and less asymmetric old/new effects for auditory P3 source.
