This study focused on the use of callous-unemotional (CU) traits to identify a subgroup of children with both attention deficit/hyperactivity disorder (ADHD) and a conduct problem diagnosis (oppositional defiant disorder [ODD] or conduct disorder [CD] who show characteristics similar to adults with psychopathy. In a clinic-referred sample of children aged 6 to 13 years (N = 154), those with diagnoses of both ADHD and ODD/CD were divided on the basis of teacher ratings of CU traits. Children high on these traits showed features typically associated with psychopathy, such as a lack of fearfulness and a reward-dominant response style. Furthermore, children with CU traits seemed less distressed by their behavior problems. These findings are consistent with research on adults showing that impulsivity and antisocial behavior alone are insufficient to document persons who fit the construct of psychopathy.

Examined the emotional reactivity of adolescents with antisocial behavior problems using a lexical decision paradigm. Evidence from adult forensic samples indicates that psychopathic traits are associated with abnormalities in the processing of emotional stimuli. In an attempt to extend these findings earlier in development, this association was tested in a sample of adolescents (mean age = 16.01; SD = 1.32) referred to a diversion program for delinquent behavior. Emotional processing was assessed by comparing recognition time for emotional words, both positive and negative, to recognition time for nonemotional words. Consistent with adult findings, the callous-unemotional (CU) dimension of psychopathy was associated with slower reaction times to negative words. In contrast, problems of impulse control were associated with faster recognition times for negative emotional words. These findings suggest that different patterns of emotional reactivity may characterize distinct subgroups of youth with antisocial behavior problems.

Examined the emotional reactivity of adolescents with antisocial behavior problems using a lexical decision paradigm. Evidence from adult forensic samples indicates that psychopathic traits are associated with abnormalities in the processing of emotional stimuli. In an attempt to extend these findings earlier in development, this association was tested in a sample of adolescents (mean age = 16.01; SD = 1.32) referred to a diversion program for delinquent behavior. Emotional processing was assessed by comparing recognition time for emotional words, both positive and negative, to recognition time for nonemotional words. Consistent with adult findings, the callous-unemotional (CU) dimension of psychopathy was associated with slower reaction times to negative words. In contrast, problems of impulse control were associated with faster recognition times for negative emotional words. These findings suggest that different patterns of emotional reactivity may characterize distinct subgroups of youth with antisocial behavior problems.

This study investigated whether and how deficits in executive functioning and distortions in appraisal processing are related to subtypes of aggressive behavior. The sample included 83 boys assessed using multi-informant reports and performance measures. Deficits in two executive functions, response inhibition and planning ability were related primarily to reactive aggression. Hostile attributional biases moderated relations between planning ability and proactive and reactive aggression subtypes, with minimal relations between planning deficits and aggression at low levels of hostile attributional bias. As the level of hostile attributional bias increased, the relation between planning deficits and reactive aggression became increasingly large in a positive direction whereas the relation between planning deficits and proactive aggression became increasingly negative. Additionally, hostile encoding moderated the relation between behavioral inhibition and reactive aggressive behavior. Results also suggested a mediational role for response inhibition in the relation between planning ability and reactive aggression.

Although several theoretical models posit that low levels of anxiety are a risk factor for psychopathy and antisocial behavior, a number of studies have reported elevated levels of anxiety among antisocial individuals. Nevertheless, most investigators in this literature have not distinguished between fearfulness and trait anxiety or attempted to separate the antisocial lifestyle dimension from the callous and unemotional dimension of psychopathy. In a study of clinically referred children (N = 143), we found that (a) measures of trait anxiety and fearlessness (low fearfulness) exhibited low correlations; (b) conduct problems tended to be positively correlated with trait anxiety, whereas callous and unemotional traits tended to be negatively correlated with trait anxiety; and (c) controlling statistically for the effects of one dimension increased the divergent correlations of the other dimension with both trait anxiety and fearful inhibition. These findings bear potentially important implications for the diagnosis and etiology of psychopathy and antisocial behavior and suggest that distinctions between trait anxiety and fearful inhibition, as well as between the two dimensions of psychopathy, may help to clarify longstanding confusion in this literature.