Similarly, robust overall visual old/new effects for P3 source were observed over mid-centroparietal sites (Figure 6B; Table 3B). Although old-greater-than-new P3 source was again more robust in controls, F(1, 38) = 23.4, p < .0001, than patients, F(1, 38) = 6.96, p = .01, there was no significant group × condition interaction.7 Likewise, patients showed only marginal reductions in overall visual P3 source compared to controls at these midline sites. In contrast, the analysis for the lateral parietal extension (P3/4, P7/8, CP5/6) of visual P3 source revealed a marked amplitude reduction for patients compared with controls, along with a significant group × condition interaction stemming from an old-greater-than-new P3 source in controls, F(1, 38) = 5.70, p = .02, but not in patients, F(1, 38) < 1.0, ns. Analogous to the auditory modality, the visual P3 source was greater over the left than right hemisphere, and a significant simple hemisphere effect was again observed for controls only, F(1, 38) = 14.8, p = .0004, but not for patients, F(1, 38) = 1.45, p = .24, providing the basis for a
