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Functional Neuroimaging Evidence for Distinct Neurobiological Pathways in Attention-Deficit/Hyperactivity Disorder

  • Michael C. Stevens
    Correspondence
    Address correspondence to Michael C. Stevens, Ph.D., Olin Neuropsychiatry Research Center, 200 Retreat Avenue, Hartford, CT 06106.
    Affiliations
    Olin Neuropsychiatry Research Center, the Institute of Living, Hartford, Connecticut

    Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut
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  • Godfrey D. Pearlson
    Affiliations
    Olin Neuropsychiatry Research Center, the Institute of Living, Hartford, Connecticut

    Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut
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  • Vince D. Calhoun
    Affiliations
    Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut

    Mind Research Network, University of New Mexico, Albuquerque, New Mexico

    Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico
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  • Katie L. Bessette
    Affiliations
    Olin Neuropsychiatry Research Center, the Institute of Living, Hartford, Connecticut

    Department of Psychology, University of Illinois Chicago, Chicago, Illinois
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Published:September 22, 2017DOI:https://doi.org/10.1016/j.bpsc.2017.09.005

      Abstract

      Background

      A challenge facing clinical neuroscientists is how best to synthesize diverse and sometimes inconsistent evidence for neuropsychological deficits and brain system dysfunction found in psychiatric disorders into models that guide etiological and treatment research. Multiple-pathway models suggest that psychiatric symptoms might arise from pathophysiology in different neural systems. This study tested dual-pathway model predictions for attention-deficit/hyperactivity disorder (ADHD) that reward and executive function cognitive deficits should be related to abnormalities in corresponding functionally specialized neural systems.

      Methods

      Behavioral inhibition and preference for immediate rewards were assessed in N = 251 adolescent boys and girls ages 12 to 18 diagnosed with DSM-IV combined-subtype ADHD or non-ADHD control subjects. Following taxometric analyses of test performance, the resulting subgroups were compared on a functional magnetic resonance imaging monetary incentive delay task probing reward anticipation and go/no-go task of motor response inhibition.

      Results

      Three ADHD subgroups were identified consistent with different proposed pathways—ADHD with executive function/motor inhibition deficits, ADHD with both executive and reward deficits, and ADHD with relatively normal test performance. Each cognitive domain mapped to different ADHD brain dysfunction features as expected. However, no brain abnormalities were found common to all ADHD subgroups despite the fact they had nearly identical ADHD-related clinical characteristics.

      Conclusions

      The results suggest that combined-subtype ADHD is a collection of discrete disorders for which a comparable behavioral end point arises through different neurobiological pathways. The findings raise caution about applying common cause, single-deficit conceptual models to individual ADHD patients and should prompt researchers to consider biologically defined, multifactorial etiological models for other psychiatric diagnoses.

      Keywords

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