The comparison of grand average ERP waveforms, across groups for the target and rare non-target conditions at Cz, are shown in Figure 1. The spatial distribution for the N2 and P3 ERP components is shown for NAC (TNAD showed similar spatial distributions). P3b shows a parietal maximum around Pz, while P3a shows a more anterior localization over Cz. N2 shows a frontal maximum around FCz for both conditions, with a more focal distribution for the target vs. the rare non-target condition. Analyses of these components were carried out at these electrodes, where the component was maximal. Figure 2 shows the ERP waveforms for TNAD and NAC for the target condition for all midline electrodes.
