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Attention Deficit Hyperactivity Disorder Join now to read essay Attention Deficit Hyperactivity Disorder Attention Deficit Hyperactivity Disorder Introduction Attention-Deficit Hyperactivity Disorder (ADHD), once called hyperkinesis or minimal brain dysfunction, is one of the most common mental disorders among children. (Elia, Ambrosini, Rapoport, 1999) It affects 3 to 5 percent of all children, with approximately 60%.