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Performance and Function Meet Structure: A White Matter Connection Tuned for Vocal Production.

John J Sidtis1,2, Muhammad Asim Mubeen1, Ali Asaei1

  • 11 Brain and Behavior Laboratory, Geriatrics Department, The Nathan Kline Institute for Psychiatric Research, Orangeburg, New York.

Brain Connectivity
|November 16, 2018
PubMed
Summary

Brain imaging reveals that white matter connections between the left frontal cortex and right caudate nucleus are linked to vocal production. Individual differences in this pathway correlate with speech amplitude and stability.

Keywords:
basal gangliacaudatediffusion tensor imaginglateralitytractographyvocalization

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Area of Science:

  • Neuroscience
  • Speech Science
  • Neuroimaging

Background:

  • Brain imaging studies reveal complex interactions during spoken language.
  • Previous research shows an inverse relationship between cerebral blood flow in the left inferior frontal region and right caudate nucleus predicts speaking rate.
  • The role of white matter morphology in this relationship remains unclear.

Purpose of the Study:

  • To investigate the contribution of white matter morphology to the functional relationship between the left inferior frontal region and right caudate nucleus during speech.
  • To assess the correlation between white matter connections and acoustic measures of vocal production.

Main Methods:

  • Diffusion tensor imaging (DTI) was used to examine ipsilateral and contralateral white matter connections between the inferior frontal regions and caudate nuclei.
  • Morphological measures of white matter integrity were analyzed.
  • Acoustic measures of vocal amplitude and frequency stability were assessed.

Main Results:

  • Ipsilateral connections between the inferior frontal regions and caudate nuclei exhibited higher fractional anisotropy and mean diffusivity compared to contralateral connections.
  • No significant advantage was found for contralateral connections in average morphology measures.
  • Individual differences in white matter morphology of the left frontal-right caudate connection significantly correlated with vocal amplitude and frequency stability.

Conclusions:

  • The left frontal-right caudate cortical-striatal pathway shows structure-function relationships relevant to speech production.
  • This pathway may be critical for coordinating cortical and subcortical activity during speech.
  • The findings support a mechanism for left-hemisphere control over vocal expression in propositional language.