White matter pathways in persistent developmental stuttering: Lessons from tractography.

Area of Science:

• Neuroscience
• Neuroimaging
• Speech Science

Background:

• Fluent speech production depends on interconnected brain regions.
• Neural pathways linking brain areas are crucial for speech fluency.
• Persistent developmental stuttering (PDS) disrupts speech fluency.

Purpose of the Study:

• Investigate the role of white matter pathways in PDS.
• Compare white matter properties in adults who stutter versus fluent speakers.

Main Methods:

• Utilized diffusion weighted imaging and tractography.
• Compared diffusion properties across 18 major cerebral white matter pathways.
• Reviewed existing literature on PDS-implicated pathways.

Main Results:

• Identified microstructural differences in the anterior callosum.
• Found alterations in the right inferior longitudinal fasciculcus.
• Observed differences in the right cingulum in individuals who stutter.

Conclusions:

• PDS is associated with widespread differences in bilateral brain networks.
• Findings indicate involvement of dorsal fronto-temporal, fronto-parietal, and motor pathways.
• Additional right hemispheric pathway differences suggest PDS affects circuits beyond known language and motor areas.