Abstract
Background Attention-deficit/hyperactivity disorder (ADHD) is associated with structural abnormalities in total gray matter, basal ganglia, and cerebellum. Findings of structural abnormalities in frontal and temporal lobes, amygdala, and insula are less consistent. Remarkably, the impact of comorbid oppositional defiant disorder (ODD) (comorbidity rates up to 60%) on these neuroanatomical differences is scarcely studied, while ODD (in combination with conduct disorder) has been associated with structural abnormalities of the frontal lobe, amygdala, and insula. The aim of this study was to investigate the effect of comorbid ODD on cerebral volume and cortical thickness in ADHD. Methods Three groups, 16 ± 3.5 years of age (mean ± SD; range 7–29 years), were studied on volumetric and cortical thickness characteristics using structural magnetic resonance imaging (surface-based morphometry): ADHD+ODD (n = 67), ADHD-only (n = 243), and control subjects (n = 233). Analyses included the moderators age, gender, IQ, and scan site. Results ADHD+ODD and ADHD-only showed volumetric reductions in total gray matter and (mainly) frontal brain areas. Stepwise volumetric reductions (ADHD+ODD < ADHD-only < control subjects) were found for mainly frontal regions, and ADHD+ODD was uniquely associated with reductions in several structures (e.g., the precuneus). In general, findings remained significant after accounting for ADHD symptom severity. There were no group differences in cortical thickness. Exploratory voxelwise analyses showed no group differences. Conclusions ADHD+ODD and ADHD-only were associated with volumetric reductions in brain areas crucial for attention, (working) memory, and decision-making. Volumetric reductions of frontal lobes were largest in the ADHD+ODD group, possibly underlying observed larger impairments in neurocognitive functions. Previously reported striatal abnormalities in ADHD may be caused by comorbid conduct disorder rather than ODD.
Original language | English |
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Pages (from-to) | 642-650 |
Number of pages | 9 |
Journal | Biological Psychiatry |
Volume | 82 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1 Nov 2017 |
Funding
This work was supported by National Institutes of Health Grant Nos. R01MH62873 and R13MH059126 and National Institute of Mental Health Grant No. R01MH094469 (to SVF), Netherlands Organization for Scientific Research Large Investment Grant No. 1750102007010 and Netherlands Organization for Scientific Research Brain and Cognition Grant No. 056-24-011 (to JKB), European Union Seventh Framework Programs AGGRESSOTYPE (Grant No. 602805 to BF) and MATRICS (Grant No. 603016 to PJH and CAH), and by grants from Radboud University Medical Center (to JKB), University Medical Center Groningen and Accare (to PJH and CAH), and Vrije Universiteit Amsterdam (to JO). BF is supported by a Vici grant from the Netherlands Organization for Scientific Research (016-310-669).
Funders | Funder number |
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European Union Seventh Framework Programs AGGRESSOTYPE | 602805, 603016 |
Netherlands Organization for Scientific Research Brain and Cognition | 056-24-011 |
Netherlands Organization for Scientific Research Large Investment | 1750102007010 |
University Medical Center Groningen and Accare | |
National Institutes of Health | R01MH62873, R13MH059126 |
National Institute of Mental Health | R01MH094469 |
Vrije Universiteit Amsterdam | |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek | 016-310-669 |
Radboud Universitair Medisch Centrum |
Keywords
- ADHD
- Comorbidity
- Cortical thickness
- ODD
- SBM
- Structural MRI