ADHD- and medication-related brain activation effects in concordantly affected parent–child dyads with ADHD

Columbia University, New York, New York, United States
Journal of Child Psychology and Psychiatry (Impact Factor: 6.46). 10/2007; 48(9):899-913. DOI: 10.1111/j.1469-7610.2007.01761.x
Source: PubMed


Several studies have documented fronto-striatal dysfunction in children and adolescents with attention deficit/hyperactivity disorder (ADHD) using response inhibition tasks. Our objective was to examine functional brain abnormalities among youths and adults with ADHD and to examine the relations between these neurobiological abnormalities and response to stimulant medication.
A group of concordantly diagnosed ADHD parent-child dyads was compared to a matched sample of normal parent-child dyads. In addition, ADHD dyads were administered double-blind methylphenidate and placebo in a counterbalanced fashion over two consecutive days of testing. Frontostriatal function was measured using functional magnetic resonance imaging (fMRI) during performance of a go/no-go task.
Youths and adults with ADHD showed attenuated activity in fronto-striatal regions. In addition, adults with ADHD appeared to activate non-fronto-striatal regions more than normals. A stimulant medication trial showed that among youths, stimulant medication increased activation in fronto-striatal and cerebellar regions. In adults with ADHD, increases in activation were observed in the striatum and cerebellum, but not in prefrontal regions.
This study extends findings of fronto-striatal dysfunction to adults with ADHD and highlights the importance of frontostriatal and frontocerebellar circuitry in this disorder, providing evidence of an endophenotype for examining the genetics of ADHD.

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    • "Additionally, those with worse inattentive symptomatology or the inattentive subtype have a greater likelihood of being diagnosed with ADHD/+RD (Levy, Young, Bennett, Martin, & Hay, 2013; Mayes & Calhoun, 2007). Some neuroimaging studies have implicated right hemispheric frontostriatal and frontoparietal attention networks in ADHD (Banich et al., 2009; Durston et al., 2003; Epstein et al., 2007). However, in our previous study (Mohl et al., 2013), we reported no activation differences along attention-related areas in ADHD/+RD compared to TDC in response to the fMRI task of sustained attention with digits as stimuli (i.e., a non-linguistic Continuous Performance Task). "
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