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Although many children with attention deficit hyperactivity disorder “outgrow” their symptoms, little is known about their brain development. In typically developing children, cortical thickness increases until adolescence, when it decreases. To assess cortical development in children with and without ADHD (mean age at baseline, 10), researchers performed MRIs at 2- to 3-year intervals. They measured cortical thickness at a total of 40,000 points in 223 children with ADHD (94% with combined or hyperactive/impulsive subtype) and in 223 typically developing controls who were matched by age, sex, and IQ. The investigators performed 824 MRI scans (e.g., 25% of children with at least 2 scans, 20% with 3 scans). A mixed-model analysis was used to…