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Structure-function abnormalities in cortical sensory projections in embouchure dystonia.

Tobias Mantel1, Eckart Altenmüller2, Yong Li1

  • 1Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Ismaningerstrasse 22, Munich, Germany.

Neuroimage. Clinical
|September 15, 2020
PubMed
Summary

Embouchure dystonia (ED) in brass players involves white matter tract abnormalities. Reduced connectivity between the primary somatosensory cortex and putamen suggests impaired sensory processing in ED.

Keywords:
Basal GangliaDiffusion TractographyDystonia, Focal, Task-SpecificMusician’s DystoniaSensorimotor Cortex

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Embouchure dystonia (ED) is a task-specific focal dystonia affecting professional brass musicians.
  • Previous research identified abnormal sensorimotor function and structure in ED patients.
  • Underlying white matter tract abnormalities in ED remain largely unknown.

Purpose of the Study:

  • To investigate structure-function abnormalities in cerebral sensorimotor pathways in ED patients.
  • To delineate white matter tract integrity and functional connectivity within the sensorimotor network.

Main Methods:

  • Employed probabilistic tractography and seed-based functional connectivity analysis.
  • Examined a sensorimotor network including supplementary motor, superior parietal, primary somatosensory/motor cortex, and putamen.
  • Performed post-hoc grey matter volumetry on affected cortical regions.

Main Results:

  • ED patients exhibited reduced axial diffusivity in primary somatosensory cortex-putamen projections.
  • Increased axial diffusivity and anisotropy were observed in supplementary motor and superior parietal cortex projections.
  • Reduced functional connectivity between the left primary somatosensory cortex and putamen correlated with diffusivity changes; increased grey matter volume in the left primary somatosensory cortex.

Conclusions:

  • Abnormal tract integrity in sensorimotor pathways supports dysfunctional sensory processing in ED.
  • Differential abnormalities in cortico-cortical and cortico-subcortical tracts suggest complex, non-uniform sensory system alterations in ED.