Altered neural substrates of cognitive control in childhood ADHD: evidence from functional magnetic resonance imaging
Chandan J Vaidya1, Silvia A Bunge, Nicole M Dudukovic
1Department of Psychology, 306A White-Gravenor, Georgetown University, Washington, DC 20057, USA. cjv2@georgetown.edu
Insights
Children with attention deficit hyperactivity disorder (ADHD) show distinct brain differences in cognitive control tasks compared to neurotypical children. These differences highlight specific neural abnormalities in ADHD, particularly in the caudate nucleus.
Area of Science:
- Neuroscience
- Developmental Psychology
- Child Psychiatry
Background:
- Cognitive control is crucial for daily functioning.
- Attention deficit hyperactivity disorder (ADHD) is associated with cognitive control deficits.
- Understanding the neural underpinnings of these deficits is vital for effective interventions.
Purpose of the Study:
- To compare the neural mechanisms of interference suppression and response inhibition in children with and without ADHD.
- To identify distinct patterns of brain activity associated with cognitive control in ADHD.
- To investigate the role of specific brain regions, like the caudate nucleus, in ADHD-related cognitive control alterations.
Main Methods:
- Utilized rapid event-related functional magnetic resonance imaging (fMRI).
- Employed a modified flanker task to assess cognitive control.
- Analyzed functional brain maps through group averaging and performance-based correlational analyses in children aged 7-11.
Main Results:
- Children with ADHD exhibited reduced engagement of a frontal-striatal-temporal-parietal network during interference suppression.
- Response inhibition involved different neural networks in ADHD (right superior temporal) versus comparison (frontal-striatal) groups.
- ADHD children demonstrated an inability to activate the caudate nucleus during cognitive tasks.
Conclusions:
- Childhood ADHD presents with distinct, not uniform, patterns of neural functional abnormality in cognitive control.
- Interference suppression and response inhibition show differential sensitivity to ADHD.
- The inability to activate the caudate nucleus may represent a core neural abnormality in ADHD.
Objective:
The study compared the neural bases of two cognitive control operations, interference suppression and response inhibition, between children with and children without attention deficit hyperactivity disorder (ADHD).
Method:
Ten children (7-11 years of age) with combined-type ADHD and 10 comparison subjects matched for age and gender underwent rapid event-related functional magnetic resonance imaging (fMRI) during performance of a modified flanker task. Functional maps were generated through group averaging and performance-based correlational analyses.
Results:
Interference suppression in ADHD subjects was characterized by reduced engagement of a frontal-striatal-temporal-parietal network that subserved healthy performance. In contrast, response inhibition performance relied upon different regions in the two groups, frontal-striatal in comparison subjects but right superior temporal in ADHD children.
Conclusions:
Alteration in the neural basis of two cognitive control operations in childhood ADHD was characterized by distinct, rather than unitary, patterns of functional abnormality. Greater between-group overlap in the neural network activated for interference suppression than in response inhibition suggests that components of cognitive control are differentially sensitive to ADHD. The ADHD children's inability to activate the caudate nucleus constitutes a core abnormality in ADHD. Observed functional abnormalities did not result from prolonged stimulant exposure, since most children were medication naive.
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