[Juvenile criminality: general strain theory and the reactive-proactive aggression trait].

The aims of the present study are to test General Strain Theory's (GST) assumptions, and to integrate the model including the proactive-reactive aggression trait. GST hypothesizes crime to be enacted in response to extra-personal stimuli (strain) and their subsequent negative emotions, especially anger. However, there exist also internally-driven manifestations of crime (instrumental or proactive), motivated by stimuli that are of an intrapersonal origin. Further, individuals differ to each other in the tendency to commit reactive or proactive or both manifestations of crime. With the goal to gain a more comprehensive model, GST variables and the reactive-proactive aggression trait are together tested as to their ability to predict criminal behaviour. Participants in the present research are 68 adolescent males with age ranging from 14 to 19 (M = 16.94, SD = 0.95). Half of the participants were jailed adolescents at the Fornelli Juvenile Detention Centre in Bari, while the remaining were adolescents with no criminal record, matched for age and level of education with the former group. An interview was administered to assess the experienced strain events, anger, and crime committed by the participants in the three months preceding the interview and also before. The reactive-proactive aggression trait was additionally measured. Results of the present study supported GST's assumptions, and confirmed the utility of integrating the model to include the proactive-reactive aggression trait. Strain events experienced in three-month time were found to influence property and violent offences committed by participants in the same time-interval as well as over this time. Furthermore,jailed participants were more likely to react with anger, and violence to strain events than non-jailed individuals, although the number of events experienced by both groups in the preceding months is similar. Finally, the results of the present study showed that proactive aggression is a strong predictor of criminal behaviour.