The results of this study provided support for our primary hypothesis that a deficit in cognitive control, as measured by the Eriksen flanker task, would be positively and significantly associated with symptoms of antisocial behavior. More specifically, we found that increasing levels of APD symptoms were associated with a greater number of incorrect responses, particularly on those trials containing response incongruent information. In light of the fact that these trials require inhibiting the incorrect response activated by the flanker stimuli, this finding provides good support for Morgan and Lilienfeld’s (2000) conclusions regarding the importance of inhibitory deficits in syndromes characterized by antisocial behavior. This finding is also consistent with the proposal that deficits in cognitive and inhibitory control are important risk factors predisposing individuals to a chronic antisocial lifestyle. Likewise, the ability to inhibit prepotent responses to contextual cues in order to maintain one’s goaldirected behavior is commonly regarded as a core skill needed to inhibit punished responses , delay gratification, tolerate frustration, abstain from drug use, and overcome aggressive urges