Diffusion tensor imaging reveals white matter abnormalities in Attention-Deficit/Hyperactivity Disorder.

Area of Science:

• Neuroscience
• Neuroimaging
• Developmental Psychology

Background:

• Attention-Deficit/Hyperactivity Disorder (ADHD) is a complex neurodevelopmental disorder.
• The underlying white matter (WM) alterations in ADHD remain incompletely understood.
• Conflicting findings exist regarding white matter integrity in ADHD.

Purpose of the Study:

• To investigate white matter (WM) differences in adolescent males with ADHD using diffusion tensor imaging (DTI).
• To examine fractional anisotropy (FA), axial diffusivity (AD), and radial diffusivity (RD) in fronto-striatal and prefrontal pathways.
• To clarify the role of fronto-striatal pathways in ADHD pathophysiology.

Main Methods:

• Diffusion Tensor Imaging (DTI) was employed.
• 12 adolescent males with ADHD and 12 typically developing controls participated.
• Tract-based spatial statistics and voxel-wide analyses with a pre-frontal mask were performed.

Main Results:

• Adolescents with ADHD exhibited significantly higher FA and AD values in fronto-striatal pathways compared to controls.
• No significant differences in radial diffusivity (RD) were found between groups.
• Elevated FA and AD suggest altered white matter microstructure in ADHD.

Conclusions:

• Prefrontal white matter variations are implicated in the pathophysiology of ADHD.
• Findings support a role for fronto-striatal pathway alterations in ADHD.
• This study contributes to understanding the neural mechanisms of ADHD.