ADHD Riddle Solved

Time Magazine | Nov. 26, 2007 | By Julie Rawe

… in a surprising new study, kids with attention-deficit/hyperactivity disorder (ADHD)–which affects 3% to 5% of school-age children–hit peak thickness in some regions an average of three years later than other kids. And the developmental lags are most pronounced in the part of the cortex that supports attention and planning.