ERIC Number: EJ852953
Record Type: Journal
Publication Date: 2009-Oct
Abstractor: As Provided
Reference Count: 0
How Distinctive Are ADHD and RD? Results of a Double Dissociation Study
de Jong, Christien G. W.; Van De Voorde, Severine; Roeyers, Herbert; Raymaekers, Ruth; Oosterlaan, Jaap; Sergeant, Joseph A.
Journal of Abnormal Child Psychology, v37 n7 p1007-1017 Oct 2009
The nature of the comorbidity between Attention-Deficit/Hyperactivity Disorder (ADHD) and Reading Disability (RD) was examined using a double dissociation design. Children were between 8 and 12 years of age and entered into four groups: ADHD only (n = 24), ADHD+RD (n = 29), RD only (n = 41) and normal controls (n = 26). In total, 120 children participated in the study; 38 girls and 82 boys. Both ADHD and RD were associated with impairments in inhibition and lexical decision, although inhibition and lexical decision were more severely impaired in RD than in ADHD. Visuospatial working memory deficits were specific to children with only ADHD. It is concluded that there was overlap on lexical decision and to a lesser extent on inhibition between ADHD and RD. In ADHD, impairments were dependent on IQ, which suggest that the overlap in lexical decision and inhibition is different in origin for ADHD and RD. The ADHD only group was specifically characterized by deficits in visuospatial working memory. Hence, no double dissociation between ADHD and RD was found on executive functioning and lexical decision.
Descriptors: Hyperactivity, Inhibition, Short Term Memory, Language Processing, Chinese, Reading Difficulties, Control Groups, Spatial Ability, Intelligence, Attention Deficit Disorders, Comparative Analysis, Reading Processes
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Publication Type: Journal Articles; Reports - Research
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