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Bullying at school is a serious social problem that influences the wellbeing of everyone involved, that is, victims, perpetrators, and bystanders. Among the many health and psychological problems that these individuals may develop, emotion dysregulation appears to be a common marker. To date, however, it remains unclear whether bullying experienced during the school years is associated with emotion dysregulation also in adulthood. In this study, by adopting a retrospective approach, we investigated whether involvement in bullying at school—either as a bully, victim, or bystander—could put these individuals at risk of presenting deficits in emotion regulation in adulthood, as assessed with behavioral (explicit) and physiological (implicit) indexes (i.e., skin conductance), and whether the association between the involvement in bullying and emotion regulation was direct or mediated by other factors, such as somatic complaints and sensation seeking. A total of 58 young adults were asked to control their emotional reactions in front of images with strong emotional content, and to explicitly evaluate them with ratings, while their arousal was measured through skin conductance. They also responded to questionnaires about retrospective involvement in bullying, somatic complaints, and sensation seeking. Results revealed that victimization and bystander behavior were directly and negatively associated with emotion regulation as assessed with skin conductance, whereas bullying was positively associated with implicit emotion regulation through the mediation of sensation seeking. Interestingly, emotion regulation as assessed with explicit ratings was not associated with any of the characteristics of the participants. Our study suggests that being directly (as victim) but also indirectly (as bystander) involved in bullying at school time is associated with difficulties in emotional wellbeing in adulthood. Furthermore, it reveals that behavioral and physiological indexes associated with emotion regulation dissociate, suggesting that subtle physiological changes may remain hidden from explicit behavior. [ABSTRACT FROM AUTHOR]