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Differences Between ADHD Inattentive and Combined Types on the CPT

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Abstract

Two samples of school-age boys with attention-deficit/hyperactivity disorder (ADHD-Combined and ADHD-Inattentive Types) and a non-ADHD control group were administered an “AX” version of the continuous performance task (CPT) to examine specific sustained attention deficits. Three levels of time-on-task were included to study performance declines, and 3 interstimulus intervals were included to examine vigilance deficits. As predicted by R. A. Barkley's and H. C. Quay's behavior inhibition deficit models (R. A. Barkley, 1997; H. C. Quay, 1997), the performance of the ADHD-Combined Type (ADHD-C) participants deteriorated more quickly than the other samples. No significant evidence of vigilance deficits among the inattentive (ADHD-IA) sample was found. These findings suggest that distinct criteria for the two ADHD subtypes may be warranted when the CPT is used for diagnostic assessment, and sustained attention-related declines in performance may be typical of the ADHD-C Type only.

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  1. Department of Psychology, State University of New York College at Cortland, Cortland, New York, 13045

    Raymond D. Collings

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Collings, R.D. Differences Between ADHD Inattentive and Combined Types on the CPT. Journal of Psychopathology and Behavioral Assessment 25, 177–189 (2003). https://doi.org/10.1023/A:1023525007441

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