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Related Concept Videos

Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.

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Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging
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White-matter abnormalities in attention deficit hyperactivity disorder: a diffusion tensor imaging study.

Timothy J Silk1, Alasdair Vance, Nicole Rinehart

  • 1School of Psychology, University of Queensland, Brisbane 4072, Queensland, Australia. t.silk@uq.edu.au

Human Brain Mapping
|December 25, 2008
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Summary
This summary is machine-generated.

Attention deficit hyperactivity disorder (ADHD) is linked to white matter abnormalities in the brain. This study found distinct differences in neural pathways, suggesting developmental anomalies in children with ADHD.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Neuroimaging

Background:

  • Attention deficit hyperactivity disorder (ADHD) is associated with widespread functional brain network dysfunctions.
  • These networks rely on the structural integrity of white-matter neural pathways.
  • Understanding white-matter development is crucial for explaining cognitive and attentional disturbances in ADHD.

Purpose of the Study:

  • To examine the structural integrity of white-matter pathways in children with ADHD.
  • To investigate the fronto-striatal and fronto-parietal circuits.
  • To correlate white-matter findings with cognitive and attentional deficits.

Main Methods:

  • Diffusion tensor imaging (DTI) was used to assess white-matter integrity.
  • Tract-based spatial statistics (TBSS) analyzed fractional anisotropy (FA) and mean diffusivity.
  • Eigenvalue analysis and tractography were employed to characterize white-matter pathways.

Main Results:

  • Abnormalities in white matter were identified in left fronto-temporal and right parietal-occipital regions in children with ADHD.
  • Participants with ADHD exhibited greater FA in specific white-matter regions, including those underlying the inferior parietal, occipito-parietal, inferior frontal, and inferior temporal cortex.
  • Eigenvalue analysis suggested reduced neural branching in key white-matter pathways in ADHD.

Conclusions:

  • The study demonstrates anomalous white-matter development in distinct cortical regions in ADHD.
  • These findings support the hypothesis of abnormal development within fronto-parietal networks in ADHD.
  • The observed white-matter differences may underlie the cognitive and attentional disturbances characteristic of ADHD.