For more than twenty years, National Institute of Mental Health neuroscientist Dr. Jay Giedd has studied the development of the adolescent brain. Decades of imaging work have led to remarkable insight and a more than a few surprises. We accept comments in the spirit of our comment policy: http://www.nimh.nih.gov/site-info/policies.shtml NIMH Privacy Policy: http://www.nimh.nih.gov/site-info/privacy-notice.shtml