Gray matter volume changes following reading intervention in dyslexic children

Area of Science:

• Neuroscience
• Developmental Psychology
• Educational Psychology

Background:

• Reading interventions can improve behavioral outcomes in children with developmental dyslexia.
• Intensive cognitive and sensorimotor training can induce changes in gray matter volume (GMV).

Purpose of the Study:

• To investigate changes in GMV following intensive reading intervention in children with dyslexia.
• To determine if observed GMV changes are specific to the intervention period.

Main Methods:

• Eleven children with dyslexia participated in an eight-week intensive reading intervention.
• Voxel-based morphometry (VBM) was used to analyze structural MRI scans obtained before, after intervention, and after a control period.
• Intervention focused on mental imagery, articulation, and tracing of letters and words.

Main Results:

• The intervention group showed significant gains in reading skills.
• GMV increased in specific brain regions, including the left anterior fusiform gyrus/hippocampus, left precuneus, right hippocampus, and right anterior cerebellum, after the intervention.
• No significant GMV changes were observed during the subsequent eight-week null period, indicating intervention specificity.

Conclusions:

• Intensive reading intervention can induce measurable changes in GMV in children with dyslexia.
• These findings demonstrate a neurobiological correlate of reading improvement following intervention in a pediatric sample.
• This study provides the first evidence of training-induced GMV changes linked to reading improvements in children with dyslexia.