Noninvasive neurostimulation of left ventral motor cortex enhances sensorimotor adaptation in speech production

Terri L. Scott, Laura Haenchen, Ayoub Daliri, Julia Chartove, Frank H. Guenther, Tyler K. Perrachione

Research output: Contribution to journalArticlepeer-review

Abstract

Sensorimotor adaptation—enduring changes to motor commands due to sensory feedback—allows speakers to match their articulations to intended speech acoustics. How the brain integrates auditory feedback to modify speech motor commands and what limits the degree of these modifications remain unknown. Here, we investigated the role of speech motor cortex in modifying stored speech motor plans. In a within-subjects design, participants underwent separate sessions of sham and anodal transcranial direct current stimulation (tDCS) over speech motor cortex while speaking and receiving altered auditory feedback of the first formant. Anodal tDCS increased the rate of sensorimotor adaptation for feedback perturbation. Computational modeling of our results using the Directions Into Velocities of Articulators (DIVA) framework of speech production suggested that tDCS primarily affected behavior by increasing the feedforward learning rate. This study demonstrates how focal noninvasive neurostimulation can enhance the integration of auditory feedback into speech motor plans.

Original languageEnglish (US)
Article number104840
JournalBrain and Language
Volume209
DOIs
StatePublished - Oct 2020

Keywords

  • Auditory feedback control
  • Auditory feedback perturbation
  • Formant perturbation
  • Motor learning
  • Premotor cortex
  • Sensorimotor adaptation
  • Speech production
  • tDCS

ASJC Scopus subject areas

  • Language and Linguistics
  • Experimental and Cognitive Psychology
  • Linguistics and Language
  • Cognitive Neuroscience
  • Speech and Hearing

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