These analyses, presented in Table 2, clearly demonstrate that only the magnitude of delta-P300 response is significantly related to externalizing proneness; affiliated theta effects are entirely nonsignificant.4 For the delta-P300 component, the main effect of Externalizing reflects the general reduction in delta response to feedback across gain and loss trials. The Feedback × Externalizing interaction is also significant, albeit smaller, indicating a modest incremental reduction in amplitude for individuals high in externalizing proneness for Gain trials as compared to Loss trials.
