For the past six years, my colleague Jason Chein and I have been studying how peers affect adolescent decision-making.  It is well known, for example, that a great deal of teenagers' risky behavior occurs when they are with their friends.  In 2005, Margo Gardner and I published an experiment showing that, when adolescents played a video driving game with their friends watching, they took more chances (and crashed more often) than they did when alone, but we found no such peer effect on adults. Jason, who is a neuroscientist, and I wanted to understand what the underlying neural processes for this might be. 

Studying peer influence in the fMRI environment is a challenging task, because we can't squeeze a group of people into the scanner at the same time. So we set up the adolescent's peers in an adjacent room, where they could see how the adolescent was "driving" when playing the game inside the magnet. We had a mike wired from that room into the scanner, so that the friends could let the adolescent know when they were watching.

Once again, we found that even being watched by friends elevates adolescents' but not adults'  risk taking. But we also found that the presence of peers affects patterns of brain activity differently among adolescents and adults. 

You can read more about our findings in an article in today's New York Times

http://well.blogs.nytimes.com/2011/02/03/teenagers-friends-and-bad-decisions/?scp=6&sq=tara%20parker%20pope&st=cse

It is common knowledge that peers influence teenagers to do things they might not do on their own. But what's important about the study is that we are able to show that the mere presence of peers -- not their direct goading -- affects adolescents' decision-making. And we are beginning to understand the underlying brain mechanisms that explain why

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