Likewise, old/new effects for visual P3 source effects were observed over mid-centroparietal sites (Figure 9B; cf. factor −135 in Table 4B) for both controls, F(1, 38) = 8.66, p = .006, and patients, F(1, 38) = 4.28, p = .046, but there were no significant effects involving group. In contrast, and similar to the stimulus-locked analysis, visual P3 source was markedly reduced in patients compared with controls at lateral-parietal sites. The overall old-greater-than-new P3 source at these sites was modulated by a marginal group × condition interaction due to a significant simple condition effect in controls, F(1, 38) = 7.55, p = .009, but not patients, F(1, 38) < 1.0, ns. Visual P3 source was again left-lateralized but the hemispheric asymmetry did not interact with group. Thus, the response-locked findings for auditory and visual P3 source are in close agreement with their stimulus-locked counterparts.
