Experiences of violence among adolescents: gender patterns in types, perpetrators and associated psychological distress

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University of North Carolina, Chapel Hill, North Carolina, USA. lisa_hightow@med.unc.edu

Neuroscience Group, Division of Basic Biomedical Sciences, Sanford School of Medicine, University of South Dakota, Vermillion, 57069-2390, USA.

Stressful experiences during adolescence can alter the trajectory of neural development and contribute to psychiatric disorders in adulthood. We previously demonstrated that adolescent male rats exposed to repeated social defeat stress show changes in mesocorticolimbic dopamine content both at baseline and in response to amphetamine when tested in adulthood. In the present study we examined whether markers of adult dopamine function are also compromised by adolescent experience of social defeat. Given that the dopamine transporter as well as dopamine D1 receptors act as regulators of psychostimulant action, are stress sensitive and undergo changes during adolescence, quantitative autoradiography was used to measure [(3)H]-GBR12935 binding to the dopamine transporter and [(3)H]-SCH23390 binding to dopamine D1 receptors, respectively. Our results indicate that social defeat during adolescence led to higher dopamine transporter binding in the infralimbic region of the medial prefrontal cortex and higher dopamine D1 receptor binding in the caudate putamen, while other brain regions analyzed were comparable to controls. Thus it appears that social defeat during adolescence causes specific changes to the adult dopamine system, which may contribute to behavioral alterations and increased drug seeking.

Pennsylvania State University, University Park, PA, USA. twf2@psu.edu

The transition to middle school is considered to be a heightened period for involvement in bullying because the lack of a defined dominance hierarchy is thought to promote jockeying for social positions among students. Accordingly, this study examined bullying in peer ecologies at the beginning of the middle grade years in rural schools that did and did not have a transition to middle school. Thirty-six schools (20 with transitions, 16 without transitions) participated in this research with a sample of 1,800 participants (52% female) who were in sixth grade during the second year of data collection. Overall, 67% were White, 19% African American, 7% Latino, 2% Native American, and 5% other (multi-racial, Asian, unknown). Compared to schools without a transition, schools with a transition had fewer bullies following the move from fifth to sixth grade and the social dynamics in schools with a transition appeared to be less supportive of bullying. Further, students in schools with a transition reported being bullied less frequently in sixth grade and they perceived the sixth grade peer ecology as being more protective against bullying than did students in schools without a transition. In addition, proportionally more youth had controversial sociometric status in schools without a transition during sixth grade than in schools with a transition. Collectively, these findings suggest that risk for involvement in bullying may be elevated in schools that do not have a transition to middle school. They also bring into question the conventional view of the small K-8 or K-12 rural school as a peaceful and supportive peer community.