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Updated: Jan 20, 2026

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Functional Parcellation of the Speech Production Cortex.

Jason A Tourville1, Alfonso Nieto-Castañón1, Matthias Heyne1

  • 1Department of Speech, Language, and Hearing Sciences, Boston University, MA.

Journal of Speech, Language, and Hearing Research : JSLHR
|August 30, 2019
PubMed
Summary

Researchers identified functional boundaries in the brain's speech production network. This improved functional magnetic resonance imaging (fMRI) analysis enhances understanding of speech motor control and brain organization.

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Neuroimaging studies have identified a core cortical network for speech production.
  • The precise functional organization within this network remains incompletely understood.

Purpose of the Study:

  • To define reliable functional boundaries within the cortical speech motor control network.
  • To enhance the sensitivity of functional magnetic resonance imaging (fMRI) analyses for speech production.
  • To deepen the understanding of speech production's functional organization in the brain.

Main Methods:

  • A data-driven approach pooling data from 12 fMRI studies on speech production.
  • Hierarchical clustering applied to contrast maps for identifying consistent functional boundaries.
  • Adaptive smoothing and watershed segmentation for boundary completion and defining functional regions of interest (fROIs).

Main Results:

  • Highly reliable functional boundaries were identified across cortical speech production areas.
  • 117 fROIs in the left and 109 in the right hemispheres were defined.
  • Clustering revealed a core sensorimotor network and a speech motor planning network, with specific left inferior frontal gyrus and visual word form area associations.

Conclusions:

  • The defined fROIs offer insights into speech production network organization.
  • These fROIs serve as a valuable tool for studying speech production.
  • Improved within-group and between-groups comparisons of speech-related brain activity are facilitated.