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Processing Speed Deficits in Attention Deficit/Hyperactivity Disorder and Reading Disability

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Abstract

The goal of the current study was to test whether deficits in processing speed (PS) may be a shared cognitive risk factor in reading disability (RD) and Attention Deficit/Hyperactivity Disorder (ADHD), which are known to be comorbid. Literature on ADHD and RD suggests that deficits on tasks with a speeded component are seen in both of these disorders individually. The current study examined a wide range of speeded tasks in RD, ADHD, comorbid RD+ADHD, and a control group to test whether RD and ADHD have similar profiles of PS deficits, and whether these deficits are shared by the two disorders. The results suggest that a general PS deficit exists in both clinical groups compared to controls, although children with RD demonstrate greater PS deficits than children with ADHD. Two tests (underadditivity and partial correlations) were conducted to test whether these PS deficits are shared. Since we found that PS deficits were underadditive in the comorbid group and that partialling PS reduced the correlation between RD and ADHD, it appears that PS is a shared cognitive risk factor that may help explain the comorbidity of these two disorders.

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Acknowledgments

This study was supported by HD 27802 and HD 04024.

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Authors and Affiliations

  1. Department of Psychology, University of Denver, 2155 S. Race St., Denver, Colorado, USA

    Michelle A. Shanahan, Bruce F. Pennington, Benjamin E. Yerys & Richard Boada

  2. Ahmanson-Lovelace Brain Mapping Center, University of California, Los Angeles, California, USA

    Ashley Scott

  3. Institute for Behavioral Genetics, University of Colorado, Boulder, Colorado, USA

    Erik G. Willcutt, Richard K. Olson & John C. DeFries

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  1. Michelle A. Shanahan
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  2. Bruce F. Pennington
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Correspondence to Michelle A. Shanahan.

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Shanahan, M.A., Pennington, B.F., Yerys, B.E. et al. Processing Speed Deficits in Attention Deficit/Hyperactivity Disorder and Reading Disability. J Abnorm Child Psychol 34, 584–601 (2006). https://doi.org/10.1007/s10802-006-9037-8

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