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Journal of Learning Disabilities, Vol. 38, No. 3, 262-280 (2005)
DOI: 10.1177/00222194050380030701
© 2005 Hammill Institute on Disabilities

Why Children with ADHD Do Not Have Low IQs

Sabrina E. B. Schuck

University of California, Irvine Child Development Center

Francis M. Crinella

University of California, Irvine

The major cognitive deficit of children with attention-deficit/hyperactivity disorder (ADHD) is impaired executive function (EF), a cognitive component that some theorists believe to be the primary substrate for the general intelligence (g) factor. We review the constructs of g and EF and the relevant research findings on ADHD. We then analyze the results of a battery of diverse tests, including measures of EF, administered to 123 boys with ADHD. The correlations among the EF measures, two well-accepted measures of IQ, and the g factor extracted from the entire battery are trivial at best. These results are discussed in the context of collateral evidence supporting the independence of g and EF and its clinical and theoretical implications.


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