Specific Contributions of Age of Onset, Callous-Unemotional Traits and Impulsivity to Reactive and Proactive Aggression in Youths with Conduct Disorders.

Youths with conduct disorders (CD) are particularly studied for their violent and aggressive behaviors. Many researchers considered aggressive behaviors as being either reactive or proactive. Moreover, factors such as age of CD onset, impulsivity, and callous-unemotional traits, separately, have been related to these different types of aggressive behaviors. However, very few studies addressed the combined contribution of these three factors on proactive and reactive aggression. This question was tested in a sample composed of 43 male adolescents with CD. A single regression analysis including all predictors and outcomes, using Bayesian statistics, was computed. Results indicated that impulsivity was related to reactive aggression, while CU traits were related to proactive aggression. These results suggest first, an important heterogeneity among youth with CD, probably leading to different trajectories and, second, that youths with callous-unemotional traits should receive special attention and care as they are more at risk for proactive aggression.

Gender Differences in at Risk Versus Offender Adolescents: A Dimensional Approach of Antisocial Behavior.

The current study investigated gender differences in the main components of antisocial behavior in an at-risk versus an offender group of adolescents. One-hundred and forty-three adolescents divided into two different risk groups [at risk (n = 54) and offenders (n = 89)] were compared according to gender (111 boys and 32 girls). Externalizing symptoms were assessed with the Delinquent and Aggressive subscales of the Youth Self-report Questionnaire, internalizing problems with the Beck Anxiety Inventory and the Beck Depressive Inventory and personality traits with the Barratt-Impulsiveness Scale as well as the Youth Psychopathic Traits Inventory. Results revealed a consistent interaction pattern, with girls presenting higher levels of externalizing symptoms, more motor impulsivity and a more arrogant and deceitful interpersonal style than boys in the at-risk group. In contrast, in the offenders' group, psychopathic traits were more present in boys than in girls. Regarding internalizing problems, girls showed more depression than boys, independently of the risk group. Among offending youths, girls present equally severe externalizing problems, and problematic personality traits as boys. At-risk girls have the highest rates of difficulties across the tested domains and should therefore be specifically targeted for prevention and intervention.

Implicit attitudes and self-concepts towards transgression and aggression: differences between male community and offender adolescents, and associations with psychopathic traits.

Research suggests that implicit attitudes play a key role in the occurrence of antisocial behaviours. This study assessed implicit attitudes and self-concepts related to aggression and transgression in community and offender adolescents, using a new set of Implicit Association Tests (IATs), and examined their association with of psychopathic traits. Thirty-six offenders and 66 community adolescents performed 4 IATs assessing 1) implicit attitudes about a) aggression and b) transgression as good, and 2) implicit self-concepts about a) aggression and b) transgression as self-descriptive. They filled in self-report questionnaires: the Youth Psychopathic Traits Inventory, the Child Behaviour Checklist, and explicit measures of their attitudes and self-concepts towards transgression and aggression. Results showed few differences between community and offender adolescents on implicit attitudes and self-concepts, and unexpected negative associations between some implicit attitudes and psychopathic traits, while the association was positive for the corresponding explicit attitudes. Possible explanations of these findings are discussed.