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    Teens Are Hardwired for Risky Behavior

    Study Shows Risk-Taking by Teens Linked to Immature Brain Development
    WebMD Health News
    Reviewed by Louise Chang, MD

    April 13, 2007 -- Most teens know plenty about the dangers of risk-taking behaviors like drinking, smoking, and taking drugs, but they are hardwired to ignore what they have learned.

    That is the conclusion from a new analysis of emerging research on adolescent brain development from Temple University professor of psychology Laurence Steinberg, PhD.

    Teenagers seek out risk-taking behaviors, the research suggests, because the brain systems involved in decision-making mature at different times.

    The section of the brain most involved in emotion and social interaction becomes very active during puberty, while the section most critical for regulating behavior is still maturing into early adulthood.

    This explains, Steinberg says, why teens are so susceptible to peer pressure and why education and prevention efforts designed to keep teens from engaging in risk-taking behaviors don't work all that well.

    "We have tried to prevent these behaviors by educating kids about the dangers of things like smoking, drinking, taking drugs, and unprotected sex," he tells WebMD. "The thinking has been if they know about the dangers they won't do these things, but that is clearly not true."

    Evolutionary Advantage

    Child and adolescent psychiatrist Jay Giedd, MD, performed much of the brain-imaging research highlighted in the analysis in his role as chief of brain imaging in the child psychiatry branch of the National Institute of Mental Health (NIMH).

    Giedd tells WebMD that the way the brain develops creates a period of risk-taking vulnerability that is greatest around puberty.

    "That is when the balance is tipped most in favor of high emotions and risk taking," he says. "The key parts of the brain involved in controlling impulses and risky behavior don't really reach maturity until about age 25."

    He adds that risk taking among adolescents is seen in all mammals, suggesting a biologic basis for the behavior that helped the class survive.

    "It is risky to leave your parents and go out on your own, but that same behavior is also good for the gene pool," he says.

    Peer Pressure

    In one of Steinberg's earlier studies, the number of risks teens took in a video driving game more than doubled in the presence of their peers, compared to when they engaged in the game alone. The presence of peers increased risk taking by 50% in college undergraduates who participated in the study, but it did not influence the number of risks older adults took.

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