No abstract

The relation between brain development across adolescence and adolescent risky behavior has attracted increasing interest in recent years. It has been proposed that adolescents are hypersensitive to reward because of an imbalance in the developmental pattern followed by the striatum and prefrontal cortex. To date, it is unclear if adolescents engage in risky behavior because they overestimate potential rewards or respond more to received rewards and whether these effects occur in the absence of decisions. In this study, we used a functional magnetic resonance imaging paradigm that allowed us to dissociate effects of the anticipation, receipt, and omission of reward in 10- to 12-year-old, 14- to 15-year-old, and 18- to 23-year-old participants. We show that in anticipation of uncertain outcomes, the anterior insula is more active in adolescents compared with young adults and that the ventral striatum shows a reward-related peak in middle adolescence, whereas young adults show orbitofrontal cortex activation to omitted reward. These regions show distinct developmental trajectories. This study supports the hypothesis that adolescents are hypersensitive to reward and adds to the current literature in demonstrating that neural activation differs in adolescents even for small rewards in the absence of choice. These findings may have important implications for understanding adolescent risk-taking behavior.

Age and gender differences in perceived social support from parents, friends, classmates, and teachers were investigated in 304 boys and 351 girls aged 9-18 years. The social support scale for children and adolescents was used for this purpose. Analyses showed that the level of perceived social support from parents and friends was similar across age groups. The study of the prominence of social support sources showed that parents and friends were perceived as equally supportive; only for the ages 16-18 years did friend support exceed parent support. Support from teachers was lower in the older age groups, and this was related to the transition from primary to secondary school. Finally, girls perceived more support from teachers, classmates and friends than boys did.

No abstract

Common folklore seems to suggest that adolescents are particularly susceptible to peer influence. However, from the literature the exact age differences in susceptibility to peer influence remain unclear. The current study's main focus was to chart the development of general susceptibility to peer pressure in a community sample of 10–18 year olds (N = 464) with the recently developed Resistance to Peer Influence Scale (RPI). The one‐factor structure of the RPI was cross‐validated in the present sample, and the RPI was equally reliable at all ages. As expected, general resistance to peer influence increased during adolescence. In addition, gender differences were most pronounced during mid‐adolescence, when girls were more resistant to peer influence than boys. These findings are explained in terms of psychosocial maturation during adolescence.