Cortical Structure in Pre-Readers at Cognitive Risk for Dyslexia: Baseline Differences and Response to Intervention

Area of Science:

• Neuroscience
• Developmental Psychology
• Educational Psychology

Background:

• Early childhood is crucial for brain development and identifying reading difficulties.
• Early interventions for at-risk children show promise, but underlying neurocognitive mechanisms need further study.
• Existing research indicates anatomical brain differences in children at risk for dyslexia.

Purpose of the Study:

• To investigate cortical structure changes following a 12-week tablet-based intervention in at-risk children.
• To compare neuroplasticity in children receiving phonics-based training versus an active control (AC) training.
• To examine differences in brain morphology between at-risk and typically developing children.

Main Methods:

• Used anatomical magnetic resonance imaging (MRI) to assess cortical structure before and after intervention.
• Compared three groups: at-risk children with phonics training, at-risk children with AC training, and typically developing children.
• Analyzed changes in brain surface area and cortical thickness, focusing on the supramarginal gyrus.

Main Results:

• At baseline, at-risk children showed greater right supramarginal gyrus surface area compared to controls.
• Post-intervention, the phonics-trained group exhibited significant thickening of the left supramarginal gyrus.
• No significant cortical thickening was observed in the active control or typical control groups.

Conclusions:

• Early anatomical differences exist in children at risk for dyslexia.
• Phonics-based interventions can induce positive changes in brain morphology, specifically in language-related regions.
• These findings enhance understanding of brain morphology's role in dyslexia risk and intervention response, prompting further research into early anatomy's impact on literacy development.