successful in detecting an association between externalizing proneness and reduced delta-P300 response in the current study, despite the lack of any association for theta-FRN. Finally, when we directly compared findings for ERN and FRN responding in participants from the Hall et al. (2007) who completed both types of tasks, we found a significant interaction between brain component (ERN vs. FRN) and externalizing scores—with follow-up tests revealing a significant association for ERN in this sample, but not for FRN. Together, these findings suggest that externalizing proneness is marked by deficits in monitoring of performance on the basis of endogenous representations, as reflected in the ERN, but not exogenous cues, as reflected in the FRN.
