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Speech entrainment compensates for Broca's area damage.

Julius Fridriksson1, Alexandra Basilakos1, Gregory Hickok2

  • 1The Aphasia Lab, Department of Communication Sciences & Disorders, University of South Carolina, USA.

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Summary

Speech entrainment (SE) improves speech fluency in Broca's aphasia by mimicking audiovisual speech. Damage to the inferior frontal gyrus predicts this positive response, aiding patient selection for SE treatment.

Keywords:
Broca's aphasiaNon-fluent speechSpeech productionTreatmentVoxel-based lesion-symptom mapping

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Area of Science:

  • Neuroscience
  • Speech-Language Pathology
  • Neurolinguistics

Background:

  • Speech entrainment (SE) is an audiovisual technique that mimics speech.
  • SE has shown potential to improve speech fluency in individuals with Broca's aphasia.
  • However, not all aphasia patients benefit from SE, necessitating identification of predictive factors.

Purpose of the Study:

  • To identify patterns of cortical damage predicting a positive response to SE's fluency-inducing effects.
  • To investigate the neural correlates of SE-induced speech improvement in aphasia.

Main Methods:

  • Forty-four chronic left hemisphere stroke patients underwent spontaneous speech and audiovisual SE tasks.
  • Speech output was measured by the number of different words per minute.
  • Voxel-wise lesion-symptom mapping (VLSM) correlated lesion locations with speech measures and improvement.

Main Results:

  • Patients with Broca's aphasia showed significantly increased speech fluency during SE compared to spontaneous speech.
  • VLSM analysis identified damage to the inferior frontal gyrus as predictive of SE-induced fluency improvement.
  • No similar fluency improvement was observed in patients with other aphasia types.

Conclusions:

  • SE enhances speech fluency, particularly in Broca's aphasia, by providing a surrogate target for speech production.
  • Inferior frontal gyrus integrity is crucial for benefiting from SE.
  • These findings support SE as a clinical tool and aid in patient selection for treatment.