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Researchers recently reported the delayed development of frontotemporal regions of children and teens with ADHD (JW Psychiatry Jan 28 2008). The same research group now expands its analysis to brain symmetry in 218 children with ADHD and 358 neurotypical controls matched for age and sex (age range, 3–22 years). Almost 95% of patients had either combined-type or hyperactive/impulsive ADHD. Participants underwent a total of 1133 MRI scans over four waves (mean ages at scans, 10–18 years). The researchers examined the scans at 40,962 homologous points in each hemisphere to compare changes in regional symmetry over time. Children were comprehensively assessed for psychopathology, IQ, and handedness (right-handed participants, 88% of the group).…