This project examines the development of prosocial behavior in adolescence with a focus on behavior changes in helping, sharing and giving, and includes behavioral assessments as well as neuroimaging. Understanding the brain basis of prosocial behavior may help to unravel why some adolescents develop social skills whereas others do not. Adolescence is an important transition period in human development, during which individual develop from children, with strong dependence on parents, to adults in society with mature social goals. This is also the time where individuals start to differentiate between helping friends and strangers. We aim to understand what are the underlying mechanisms that drive these changes in prosocial motivations, and we hope to eventually contribute to making this a more caring and prosocial society.