Structural brain change in Attention Deficit Hyperactivity Disorder identified by meta-analysis.

Area of Science:

• Neuroimaging
• Genetics
• Neuroscience

Background:

• Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder.
• Gray matter alterations are implicated in ADHD pathophysiology.
• Novel meta-analysis techniques can integrate neuroimaging and genetic data.

Purpose of the Study:

• To map gray matter changes in ADHD using a hybrid neuroimaging and genetic meta-analysis approach.
• To identify specific brain regions affected by gray matter reduction or افزایش in ADHD.
• To explore potential anatomical markers for cognitive dysfunction in ADHD.

Main Methods:

• Systematic literature search for voxel-based structural MRI studies in ADHD.
• Hybrid meta-analysis combining Activation Likelihood Estimation (ALE) and Genome Scan Meta-Analysis (GSMA).
• Analysis of coordinate data to detect three-dimensional conjunctions of gray matter differences, weighted by sample size.

Main Results:

• Meta-analysis of 7 studies (114 ADHD patients, 143 controls) revealed significant gray matter reduction in the right putamen/globus pallidus in ADHD.
• No consistent regional gray matter increases were identified across studies.
• The identified gray matter reduction in the right putamen/globus pallidus is a key finding.

Conclusions:

• ADHD is associated with gray matter reduction in the right putamen/globus pallidus.
• This region may be a critical anatomical marker for frontostriatal circuit dysfunction and cognitive control deficits.
• Previous research links right putamen lesions to ADHD symptoms following pediatric head injuries.