Volume 1124, Issue 1 p. 111-126

The Adolescent Brain

B.J. Casey

B.J. Casey

Sackler Institute, Weill Medical College of Cornell University, New York, New York, USA

Search for more papers by this author
Rebecca M. Jones

Rebecca M. Jones

Sackler Institute, Weill Medical College of Cornell University, New York, New York, USA

Search for more papers by this author
Todd A. Hare

Todd A. Hare

California Institute of Technology, Pasadena, California, USA

Search for more papers by this author
First published: 03 April 2008
Citations: 1,297
Address for correspondence: BJ Casey, Sackler Institute, Weill Cornell Medical College, 1300 York Avenue, Box 140, New York, NY 10021, Voice: +212-746-5832 fax: 212-746-5755 USA.
[email protected]

Abstract

Adolescence is a developmental period characterized by suboptimal decisions and actions that are associated with an increased incidence of unintentional injuries, violence, substance abuse, unintended pregnancy, and sexually transmitted diseases. Traditional neurobiological and cognitive explanations for adolescent behavior have failed to account for the nonlinear changes in behavior observed during adolescence, relative to both childhood and adulthood. This review provides a biologically plausible model of the neural mechanisms underlying these nonlinear changes in behavior. We provide evidence from recent human brain imaging and animal studies that there is a heightened responsiveness to incentives and socioemotional contexts during this time, when impulse control is still relatively immature. These findings suggest differential development of bottom-up limbic systems, implicated in incentive and emotional processing, to top-down control systems during adolescence as compared to childhood and adulthood. This developmental pattern may be exacerbated in those adolescents prone to emotional reactivity, increasing the likelihood of poor outcomes.