Antisocial individuals present behaviors that violate the social norms and the rights of others. In the present study, we examine whether biases in monitoring the self-generated cognitive material might be linked to antisocial manifestations during adolescence. We further examine the association with psychopathic traits and conduct problems (CP). Methods: Sixty-five incarcerated adolescents (IA; Mage= 15.85, SD=1.30) and 88 community adolescents (CA; M age=15.78, SD=1.60) participated in our

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... dy. In the IA group, 28 adolescents presented CP (Mage=16.06, SD=1.41) and 19 did not meet the diagnostic criteria for CP (Mage=15.97, SD=1.20). Source monitoring was assessed through a speech-monitoring task, using items requiring different levels of cognitive effort; recognition and source-monitoring bias scores (internalizing and externalizing biases) were calculated. Results: Between group comparisons indicate greater overall biases and different patterns of biases in the source monitoring. IA participants manifest a greater externalizing bias, whereas CA participants present a greater internalizing bias. In addition, IA with CP present different patterns of item recognition. Conclusions: These results indicate that the two groups of adolescents present different types of source-monitoring bias for self-generated speech. Future studies may examine the developmental implications of self-monitoring biases in the perseverance of antisocial behaviors from adolescence to adulthood.