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White matter correlates of sensorimotor synchronization in persistent developmental stuttering.

Sivan Jossinger1, Anastasia Sares2, Avital Zislis1

  • 1The Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel.

Journal of Communication Disorders
|December 2, 2021
PubMed
Summary
This summary is machine-generated.

Adults who stutter show altered white matter connectivity in dorsal tracts and cerebellar pathways, impacting sensorimotor synchronization. These differences highlight distinct neural mechanisms underlying stuttering and fluent speech.

Keywords:
CerebellumDiffusion MRIDorsal pathwaysSensorimotor synchronizationTractographypersistent developmental stuttering

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Area of Science:

  • Neuroscience
  • Speech and Language Sciences
  • Neuroimaging

Background:

  • Persistent developmental stuttering is associated with deficits in sensorimotor synchronization.
  • Previous diffusion imaging studies suggest differences in white matter pathways in adults who stutter (AWS).

Purpose of the Study:

  • To investigate microstructural white matter differences between AWS and fluent speakers.
  • To evaluate the relationship between white matter diffusivity and sensorimotor synchronization in both groups.

Main Methods:

  • Participants underwent diffusion MRI and a sensorimotor synchronization task.
  • Analysis focused on cerebellar peduncles and dorsal/ventral language pathways.
  • Correlations between diffusion measures and synchronization were assessed.

Main Results:

  • AWS exhibited lower fractional anisotropy (FA) in the left arcuate fasciculus and higher mean diffusivity (MD) in the bilateral frontal aslant tract compared to fluent speakers.
  • Significant group differences were found in the left middle cerebellar peduncle (FA and MD).
  • A double dissociation was observed: MD in the left inferior cerebellar peduncle correlated with asynchrony in AWS, while FA in the left arcuate fasciculus correlated with asynchrony in fluent speakers.

Conclusions:

  • Stuttering involves altered connectivity in dorsal tracts, with AWS potentially utilizing cerebellar tracts for timing.
  • Microstructural analysis linked to behavioral measures reveals functional differences in white matter connectivity.