We found that prosocial development depends on several contextual factors, including the target to whom the giving behavior is directed and whether prosocial acts are observed by others. We further observed that the dorsolateral prefrontal cortex, a brain region associated with cognitive control, is more engaged for small giving in younger adolescents and large giving in older adolescents, demonstrating a shift in strategies for giving. Next, we found that sharing leads to similar activation in the reward network of the brain for self and close others, specifically parents, but not for distant others, such as strangers. A subgroup of parents who also participated in the study displayed similar reward activity in the brain when sharing with their children. In the upcoming two years, we will further examine which parts of giving, sharing and helping can be stimulated using interventions and whether there are sensitive phases in development for fostering prosocial behavior. We expect to find that contributing to needs to others is a fundamental need and gives vigor to adolescents, boosts positive feelings and reduces negative feelings.