Figure 3 presents ERP response data for gain versus loss trials as a function of scores on the ESI-100, in terms of TD peak scores and TF component scores. The topmost line plot depicts unfiltered TD waveforms for gain and loss trials for participants falling within the top and bottom quartiles of the distribution of scores on the ESI-100. Here, a broad amplitude reduction is evident for individuals in the top quartile relative to those in the bottom quartile. In this unfiltered data, however, it is unclear whether this overall amplitude reduction reflects differences in theta-FRN or delta-P300. The basis of the overall group effect becomes apparent in the two adjacent line plots below this, which display theta- and delta-filtered TD signal averages, and in the color surface plots following these, which depict results for the theta and delta TF-PCs. Specifically, it is clear that the group difference in ERP response to feedback is confined to the delta-P300 component, with no significant difference evident for the theta-FRN component. Notably, both low and high externalizing groups show robust amplification of theta
