ABSTRACT. Background: According to the DSM-IV there are three subtypes of Attention Deficit Hyperactivity Disorder (ADHD): ADHD, Predominantly Inattentive Type (ADHD-I), ADHD, Combined Type (ADHD-C), and ADHD, Predominantly Hyperactive-Impulsive Type (ADHD-H/I). The central nervous system physiological distinctions between these categories remain unclear.

Objective: To assess children with ADHD diagnosed at a university ADHD clinic on peripheral and EEG psychophysiologic measures to determine if psychophysiology is distinctive across diagnostic categories and experimental conditions.

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