Multimodal MR-imaging reveals large-scale structural and functional connectivity changes in profound early blindness

Area of Science:

• Neuroscience
• Neuroimaging
• Brain Plasticity

Background:

• Profound blindness induces significant anatomical and functional brain changes.
• Previous studies on blindness-induced neuroplasticity have yielded inconsistent findings.
• A multimodal approach is needed to reconcile these discrepancies.

Purpose of the Study:

• To investigate neuroplastic reorganization in early blindness using a multimodal MR imaging approach.
• To reconcile inconsistent findings from previous studies on brain changes in blindness.
• To provide complementary structural and functional insights into brain reorganization.

Main Methods:

• Multimodal magnetic resonance (MR)-based imaging was employed.
• Techniques included gray matter structural morphometry, high angular resolution diffusion imaging (HARDI), and resting state functional connectivity MRI (rsfcMRI).
• Brains of early blind individuals were compared to sighted controls.

Main Results:

• Decreased cortical volume and thickness in visual processing areas (occipital, temporal); increased volume in parietal cortex.
• HARDI revealed altered white matter connectivity: increased left-lateralized connectivity (frontal-temporal) and decreased connectivity (frontal, somatosensory, occipital-cingulate).
• rsfcMRI showed altered functional connectivity: increased temporal-frontal connectivity and decreased occipital-frontal, somatosensory-motor, and temporal-parietal connectivity.

Conclusions:

• Multimodal imaging provides complementary evidence on neuroplastic reorganization in early blindness.
• Findings highlight both consistency and potential contradictions in structural and functional brain changes.
• The study reconciles previous inconsistent findings, offering a comprehensive view of brain adaptation to blindness.