The current study was conducted with two specific aims in mind: (a) to evaluate whether the FRN exhibits reduced amplitude as a function of higher externalizing tendencies, and (b) to assess for accompanying reductions in amplitude of the P300 response to feedback stimuli in the same task. As stated earlier, these aims were intended to shed light on two broader questions about deficits in brain reactivity related to externalizing proneness: (1) Is increased externalizing proneness associated with generalized deficits in performance monitoring, affecting registration of external feedback (reflected by the FRN) as well as self-recognition of errors (reflected by the ERN)?; and (2) To what extent do P300 response deficits, demonstrated for target stimuli in oddball tasks in prior work, generalize to stimuli of other types in a non-oddball task?
