Fig. 3.
Electrophysiological analyses (group grand averages). (A) Average CDA for control subjects collapsed across hemifield. For controls, CDA amplitude increases with memory load (*main effect of load, P < 0.0005). (B) Summary of CDA findings for ipsilesional stimuli in the two patient groups (shown in detail in C–F) and for left hemifield stimuli for controls. For ipsilesional stimuli (C and E), both controls and the PFC group show a significant effect of memory load on CDA (*P < 0.05, error bars represent SEM) that is not seen in the BG group (ns, not significant). For contralesional stimuli (D and F), the relationship between CDA and load is abolished in both patient groups. Both patient groups generated a sustained negative shift for contralesional stimuli that was not sensitive to VWM load (SI Results).