CHICAGO -- Children diagnosed with attention deficit-hyperactivity disorder (ADHD) appear to have brain abnormalities that can be observed with MRI, findings that may allow for a more objective diagnosis of the disorder, a researcher suggested here. After analyzing MRI scans of almost 8,000 children, investigators observed abnormal connectivity in the brain networks involved in memory processing and auditory processing among those with ADHD, said Huang Lin, PhD, a postgraduate fellow at the Yale School of Medicine in New Haven, Connecticut.