Studies examining sensorimotor adaptation of speech to changing sensory conditions have demonstrated a central role for both auditory and somatosensory feedback in speech motor learning. The potential influence of visual feedback of oral articulators, which is not typically available during speech production but may nonetheless enhance oral motor control, remains poorly understood. The present study explores the influence of ultrasound visual feedback of the tongue on adaptation of speech production (focusing on the sound /s/) to a physical perturbation of the oral articulators (prosthesis altering the shape of the hard palate). Two visual feedback groups were tested that differed in the two-dimensional plane being imaged (coronal or sagittal) during practice producing /s/ words, along with a no-visual-feedback control group. Participants in the coronal condition were found to adapt their speech production across a broader range of acoustic spectral moments and syllable contexts than the no-feedback controls. In contrast, the sagittal group showed reduced adaptation compared to no-feedback controls. The results indicate that real-time visual feedback of the tongue is spontaneously integrated during speech motor adaptation, with effects that can enhance or interfere with oral motor learning depending on compatibility of the visual articulatory information with requirements of the speaking task.
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August 2021
August 03 2021
Visual feedback of the tongue influences speech adaptation to a physical modification of the oral cavity
Guillaume Barbier;
Guillaume Barbier
1
École d'Orthophonie et d'Audiologie, Université de Montréal
, Case Postale 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
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Ryme Merzouki;
Ryme Merzouki
1
École d'Orthophonie et d'Audiologie, Université de Montréal
, Case Postale 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
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Mathilde Bal;
Mathilde Bal
1
École d'Orthophonie et d'Audiologie, Université de Montréal
, Case Postale 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
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Shari R. Baum;
Shari R. Baum
2
School of Communication Sciences and Disorders, McGill University
, 2001 McGill College Avenue, Suite 800, Montréal, Québec H3A 1G1, Canada
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Douglas M. Shiller
Douglas M. Shiller
a)
1
École d'Orthophonie et d'Audiologie, Université de Montréal
, Case Postale 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
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a)
Electronic mail: [email protected]
J. Acoust. Soc. Am. 150, 718–733 (2021)
Article history
Received:
February 04 2021
Accepted:
June 15 2021
Citation
Guillaume Barbier, Ryme Merzouki, Mathilde Bal, Shari R. Baum, Douglas M. Shiller; Visual feedback of the tongue influences speech adaptation to a physical modification of the oral cavity. J. Acoust. Soc. Am. 1 August 2021; 150 (2): 718–733. https://doi.org/10.1121/10.0005520
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