Finally, the prominent inverted old/new effects for the associated sink activity at lateral-frontotemporal sites (FC5/6, F7/8, FT9/10, T7/8) for auditory P3 source were targeted in an additional analysis (Figure 6A; Table 3A), which confirmed the presence of this condition effect across groups. There was also a group main effect stemming from increased sinks in patients compared with controls, but a group × site interaction (see supplementary material) and simple group effects at each site revealed that this group difference was significant at lateral-temporal sites only (at T7/8, F(1, 38) = 14.3, p = .0005; at FT9/10, F7/8, FC5/6, all F(1, 38) ≤ 2.61, all p ≥ .11). A significant three-way group × condition × hemisphere interaction originated from greater inverted old/new effects over right than left sites for controls, F(1, 38) = 4.44, p = .04, whereas patients had no asymmetric condition effects, F(1, 38) = 1.40, p = .24 (cf. old-minus-new difference maps in Figure 6A). Thus, inverted lateral-frontotemporal old/new effects for stimulus-locked auditory P3 source were present in both groups but most robust in patients over the left lateral-temporal region.
