Specificity of basic information processing and inhibitory control in attention deficit hyperactivity disorder

G.A. Salum, J.A. Sergeant, E.J. Sonuga-Barke, J. Vandekerckhove, A. Gadelha, P.M. Pan, T. Moriyama, A.S. Graeff-Martins, P.G. de Alvarenga, M.C. do Rosario, G.G. Manfro, G. Polanczyk, L.A.P. Rohde

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Background Both inhibitory-based executive functioning (IB-EF) and basic information processing (BIP) deficits are found in clinic-referred attention deficit hyperactivity disorder (ADHD) samples. However, it remains to be determined whether: (1) such deficits occur in non-referred samples of ADHD; (2) they are specific to ADHD; (3) the co-morbidity between ADHD and oppositional defiant disorder/conduct disorder (ODD/CD) has additive or interactive effects; and (4) IB-EF deficits are primary in ADHD or are due to BIP deficits. Method We assessed 704 subjects (age 6-12 years) from a non-referred sample using the Development and Well-Being Assessment (DAWBA) and classified them into five groups: typical developing controls (TDC; n=378), Fear disorders (n=90), Distress disorders (n=57), ADHD (n=100), ODD/CD (n=40) and ADHD+ODD/CD (n=39). We evaluated neurocognitive performance with a Two-Choice Reaction Time Task (2C-RT), a Conflict Control Task (CCT) and a Go/No-Go (GNG) task. We used a diffusion model (DM) to decompose BIP into processing efficiency, speed-accuracy trade-off and encoding/motor function along with variability parameters. Results Poorer processing efficiency was found to be specific to ADHD. Faster encoding/motor function differentiated ADHD from TDC and from fear/distress whereas a more cautious (not impulsive) response style differentiated ADHD from both TDC and ODD/CD. The co-morbidity between ADHD and ODD/CD reflected only additive effects. All ADHD-related IB-EF classical effects were fully moderated by deficits in BIP. Conclusions Our findings challenge the IB-EF hypothesis for ADHD and underscore the importance of processing efficiency as the key specific mechanism for ADHD pathophysiology. © 2013 Cambridge University Press.
Original languageEnglish
Pages (from-to)617-631
JournalPsychological Medicine
Volume44
Issue number3
DOIs
Publication statusPublished - 2014

Bibliographical note

PT: J; NR: 96; TC: 2; J9: PSYCHOL MED; PG: 15; GA: 302GX; UT: WOS:000330592300015

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