The power of friendship: The developmental significance of friendships from a neuroscience perspective

Forming and maintaining friendships is one of the most important developmental tasks in adolescence. Supportive and high-quality friendships have been related to positive developmental outcomes and mental health, both concurrently and in the long term. Friendships also protect against negative effects of adverse experiences, such as peer victimization and internalizing behaviors. Despite this ample evidence relating friendships to well-being, we know relatively little about the underlying mechanisms involved. In this article, I review brain imaging research on friendships and highlight its contribution to our understanding of how interactions with friends relate to well-being. Studies suggest that friendships involve reward and motivational processes (involving the ventral striatum and the ventromedial prefrontal cortex), and self- and other-related mentalizing processes (involving the medial prefrontal cortex and the temporoparietal regions). I conclude with suggestions for research on how neural patterns relate to individual differences in psychosocial outcomes and mental health.