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A single exposure to altered auditory feedback causes observable sensorimotor adaptation in speech

Lana Hantzsch, View ORCID ProfileBenjamin Parrell, View ORCID ProfileCaroline A. Niziolek
doi: https://doi.org/10.1101/2021.07.26.453857
Lana Hantzsch
1Waisman Center, University of Wisconsin-Madison
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Benjamin Parrell
1Waisman Center, University of Wisconsin-Madison
2Department of Communication Sciences and Disorders, University of Wisconsin-Madison
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  • For correspondence: cniziolek@wisc.edu bparrell@wisc.edu
Caroline A. Niziolek
1Waisman Center, University of Wisconsin-Madison
2Department of Communication Sciences and Disorders, University of Wisconsin-Madison
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  • ORCID record for Caroline A. Niziolek
  • For correspondence: cniziolek@wisc.edu bparrell@wisc.edu
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Abstract

Sensory errors caused by perturbations to movement-related feedback induce two types of behavioral changes that oppose the perturbation: rapid compensation within a movement, as well as longer-term adaptation of subsequent movements. Although adaptation is hypothesized to occur whenever a sensory error is perceived (including after a single exposure to altered feedback), adaptation of articulatory movements in speech has only been observed after repetitive exposure to auditory perturbations, questioning both current theories of speech sensorimotor adaptation as well as the universality of more general theories of adaptation. Thus, positive evidence for the hypothesized single-exposure or “one-shot” learning would provide critical support for current theories of speech sensorimotor learning and control and align adaptation in speech more closely with other motor domains. We measured one-shot learning in a large dataset in which participants were exposed to intermittent, unpredictable auditory perturbations to their vowel formants (the resonant frequencies of the vocal tract that distinguish between different vowels). On each trial, participants spoke a word out loud while their first formant was shifted up, shifted down, or remained unshifted. We examined whether the perturbation on a given trial affected speech on the subsequent, unperturbed trial. We found that participants adjusted their first formant in the opposite direction of the preceding shift, demonstrating that learning occurs even after a single auditory perturbation as predicted by current theories of sensorimotor adaptation. While adaptation and the preceding compensation responses were correlated, this was largely due to differences across individuals rather than within-participant variation from trial to trial. These findings are more consistent with theories that hypothesize adaptation is driven directly by updates to internal control models than those that suggest adaptation results from incorporation of feedback responses from previous productions.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • ↵* Equal contribution

  • https://github.com/blab-lab/postMan

  • https://github.com/carrien/free-speech

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted July 26, 2021.
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A single exposure to altered auditory feedback causes observable sensorimotor adaptation in speech
Lana Hantzsch, Benjamin Parrell, Caroline A. Niziolek
bioRxiv 2021.07.26.453857; doi: https://doi.org/10.1101/2021.07.26.453857
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A single exposure to altered auditory feedback causes observable sensorimotor adaptation in speech
Lana Hantzsch, Benjamin Parrell, Caroline A. Niziolek
bioRxiv 2021.07.26.453857; doi: https://doi.org/10.1101/2021.07.26.453857

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