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Mechanisms underpinning inattention and hyperactivity: neurocognitive support for ADHD dimensionality

Published online by Cambridge University Press:  25 April 2014

G. A. Salum*
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil Federal University of Rio Grande do Sul, Porto Alegre, Brazil
E. Sonuga-Barke
Affiliation:
Southampton University, UK Ghent University, Belgium
J. Sergeant
Affiliation:
Vrije Universiteit, The Netherlands
J. Vandekerckhove
Affiliation:
University of California, USA
A. Gadelha
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil Federal University of Rio Grande do Sul, Porto Alegre, Brazil
T. S. Moriyama
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil São Paulo University, Brazil
A. S. Graeff-Martins
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil São Paulo University, Brazil
G. G. Manfro
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil Federal University of Rio Grande do Sul, Porto Alegre, Brazil
G. Polanczyk
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil São Paulo University, Brazil
L. A. P. Rohde
Affiliation:
National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil Federal University of Rio Grande do Sul, Porto Alegre, Brazil
*
*Address for correspondence: G. A. Salum, M.D., Ph.D., Hospital de Clínicas de Porto Alegre, Ramiro Barcelos 2350, room 2202, Porto Alegre 90035-003, Brazil. (Email:gsalumjr@gmail.com)

Abstract

Background.

Taxometric and behavioral genetic studies suggest that attention deficit hyperactivity disorder (ADHD) is best modeled as a dimension rather than a category. We extended these analyses by testing for the existence of putative ADHD-related deficits in basic information processing (BIP) and inhibitory-based executive function (IB-EF) in individuals in the subclinical and full clinical ranges. Consistent with the dimensional model, we predicted that ADHD-related deficits would be expressed across the full spectrum, with the degree of deficit linearly related to the severity of the clinical presentation.

Method.

A total of 1547 children (aged 6–12 years) participated in the study. The Development and Well-Being Assessment (DAWBA) was used to classify children into groups according to levels of inattention and hyperactivity independently: (1) asymptomatic, (2) subthreshold minimal, (3) subthreshold moderate and (4) clinical ADHD. Neurocognitive performance was evaluated using a two-choice reaction time task (2C-RT) and a conflict control task (CCT). BIP and IB-EF measures were derived using a diffusion model (DM) for decomposition of reaction time (RT) and error data.

Results.

Deficient BIP was found in subjects with minimal, moderate and full ADHD defined in terms of inattention (in both tasks) and hyperactivity/impulsivity dimensions (in the 2C-RT). The size of the deficit increased in a linear manner across increasingly severe presentations of ADHD. IB-EF was unrelated to ADHD.

Conclusions.

Deficits in BIP operate at subclinical and clinical levels of ADHD. The linear nature of this relationship provides support for a dimensional model of ADHD in which diagnostic thresholds are defined in terms of clinical and societal burden rather than representing discrete pathophysiological states.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 2014 

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