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Robust Sensorimotor Learning during Variable Sentence-Level Speech.

Daniel R Lametti1, Harriet J Smith2, Kate E Watkins2

  • 1Department of Experimental Psychology, University of Oxford, Oxford, UK; Department of Psychology, Acadia University, Wolfville, Nova Scotia, Canada.

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|September 25, 2018
PubMed
Summary
This summary is machine-generated.

Speech sensorimotor learning adapts to real-time voice feedback. This study shows the brain predicts auditory consequences during variable sentence production, enabling rapid motor plan adjustments.

Keywords:
motor learningpredictionsensorimotor adaptationsentence productionspeech

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Area of Science:

  • Neuroscience
  • Speech Science
  • Auditory Perception

Background:

  • Sensorimotor learning in speech is typically studied with limited, repetitive speech tasks.
  • Existing models suggest forward models predict sensory outcomes, driving learning via prediction errors.
  • The ability to adapt speech motor plans for complex, real-world sentences remains unclear.

Purpose of the Study:

  • To investigate sensorimotor learning during the production of varied sentences.
  • To determine if the brain predicts auditory consequences for complex speech.
  • To test rapid updating of speech motor plans in response to auditory prediction errors.

Main Methods:

  • Real-time alterations of speech feedback were used during sentence production.
  • Participants produced 50 sentences with varying length, vocabulary, and grammar.
  • Vowel sounds were altered and played back in near real-time to assess auditory error feedback.

Main Results:

  • Robust feedforward changes in sentence production were observed in all participants.
  • These production changes accurately compensated for the auditory alterations.
  • Learned changes transferred to the production of single words with different vowel sounds.

Conclusions:

  • The brain actively predicts auditory consequences during variable sentence-level speech production.
  • This predictive capability allows for rapid and precise updating of speech motor plans.
  • Findings challenge previous notions of limited sensorimotor adaptation in speech.