ERP waveforms were extracted by synchronously averaging all trials having the correct behavioral responses for each of the three stimuli (target, rare non-target and standard non-target). For each subject, the P3b ERP peak at electrode site Pz for the target stimulus and the P3a ERP peak at electrode site FCz for the rare non-target stimulus were extracted using a semi-automated peak detection algorithm in BVA. Only the P3b and P3a peaks at electrode sites Pz and FCz respectively were extracted for use in this study, as previous studies on this data had found these ERP amplitudes significantly discriminated the LTAAs and NACs (Fein and Chang, 2006).
