This study examined whether children (ages 6-16) diagnosed as having attention deficit disorder with hyperactivity (ADD/H) could be differentiated from those diagnosed as having attention deficit disorder without hyperactivity (ADD/WO), on an anterior-posterior gradient paradigm. It was predicted that ADD/H children (N=23) would have more deficits on tasks measuring sequential, cognitive operations and those assessing anterior or frontal lobe functioning, whereas ADD/WO children (N=19) would have more deficits on tasks measuring visual-spatial abilities and those reflecting posterior or parietal lobe functioning. No significant differences between the groups emerged across standardized and well-normed measures. Implications for testing the anterior-posterior gradient paradigm with children are discussed. (15 references) (Author/JDD)