Brain Myelin in Children With Attention-Deficit/Hyperactivity Disorder: A Longitudinal T1-Weighted/T2-Weighted Ratio...

Area of Science:

• Neuroscience
• Developmental Psychology
• Pediatric Neurology

Background:

• Attention Deficit/Hyperactivity Disorder (ADHD) is linked to widespread brain network dysfunction.
• White matter (WM) organization is a potential factor in ADHD pathophysiology.
• Understanding WM development in ADHD is crucial for diagnosis and treatment.

Purpose of the Study:

• To investigate the developmental trajectories of brain white matter (WM) myelination in children with ADHD.
• To compare WM myelination development between children with and without ADHD.
• To identify potential differences in WM development related to ADHD.

Main Methods:

• Longitudinal neuroimaging study of 400 children (9-14 years), including 195 with ADHD.
• Examined brain WM myelin using T1w/T2w-ratio across 71 WM tracts over 3 time points.
• Utilized deep-learning automated tractography and linear/non-linear regression for analysis.

Main Results:

• Children with ADHD exhibited similar WM myelination developmental profiles compared to neurotypical children.
• No significant cross-sectional or longitudinal group differences in WM myelination were observed.
• WM myelination showed a non-linear, U-shaped developmental increase with age across most tracts.

Conclusions:

• Brain white matter myelination development does not appear to differ significantly between children with and without ADHD.
• Observed differences in ADHD brain WM development may be related to factors beyond myelin, such as fiber architecture or axon diameter.
• Further multi-modal longitudinal research is needed to fully understand ADHD brain development.