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Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx

Investigations of neuromuscular control of voice production have primarily focused on the roles of muscle activation levels, posture, and stiffness at phonation onset. However, little work has been done investigating the stability of the phonation process in regards to spontaneous changes in vibrato...

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Detalles Bibliográficos
Autores principales: Schlegel, Patrick, Berry, David A., Chhetri, Dinesh K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9009716/
https://www.ncbi.nlm.nih.gov/pubmed/35421159
http://dx.doi.org/10.1371/journal.pone.0266910
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author Schlegel, Patrick
Berry, David A.
Chhetri, Dinesh K.
author_facet Schlegel, Patrick
Berry, David A.
Chhetri, Dinesh K.
author_sort Schlegel, Patrick
collection PubMed
description Investigations of neuromuscular control of voice production have primarily focused on the roles of muscle activation levels, posture, and stiffness at phonation onset. However, little work has been done investigating the stability of the phonation process in regards to spontaneous changes in vibratory mode of vocal fold oscillation as a function of neuromuscular activation. We evaluated 320 phonatory conditions representing combinations of superior and recurrent laryngeal nerve (SLN and RLN) activations in an in vivo canine model of phonation. At each combination of neuromuscular input, airflow was increased linearly to reach phonation onset and beyond from 300 to 1400 mL/s. High-speed video and acoustic data were recorded during phonation, and spectrograms and glottal-area-based parameters were calculated. Vibratory mode changes were detected based on sudden increases or drops of local fundamental frequency. Mode changes occurred only when SLNs were concurrently stimulated and were more frequent for higher, less asymmetric RLN stimulation. A slight increase in amplitude and cycle length perturbation usually preceded the changes in the vibratory mode. However, no inherent differences between signals with mode changes and signals without were found.
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spelling pubmed-90097162022-04-15 Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx Schlegel, Patrick Berry, David A. Chhetri, Dinesh K. PLoS One Research Article Investigations of neuromuscular control of voice production have primarily focused on the roles of muscle activation levels, posture, and stiffness at phonation onset. However, little work has been done investigating the stability of the phonation process in regards to spontaneous changes in vibratory mode of vocal fold oscillation as a function of neuromuscular activation. We evaluated 320 phonatory conditions representing combinations of superior and recurrent laryngeal nerve (SLN and RLN) activations in an in vivo canine model of phonation. At each combination of neuromuscular input, airflow was increased linearly to reach phonation onset and beyond from 300 to 1400 mL/s. High-speed video and acoustic data were recorded during phonation, and spectrograms and glottal-area-based parameters were calculated. Vibratory mode changes were detected based on sudden increases or drops of local fundamental frequency. Mode changes occurred only when SLNs were concurrently stimulated and were more frequent for higher, less asymmetric RLN stimulation. A slight increase in amplitude and cycle length perturbation usually preceded the changes in the vibratory mode. However, no inherent differences between signals with mode changes and signals without were found. Public Library of Science 2022-04-14 /pmc/articles/PMC9009716/ /pubmed/35421159 http://dx.doi.org/10.1371/journal.pone.0266910 Text en © 2022 Schlegel et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Schlegel, Patrick
Berry, David A.
Chhetri, Dinesh K.
Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
title Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
title_full Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
title_fullStr Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
title_full_unstemmed Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
title_short Analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
title_sort analysis of vibratory mode changes in symmetric and asymmetric activation of the canine larynx
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9009716/
https://www.ncbi.nlm.nih.gov/pubmed/35421159
http://dx.doi.org/10.1371/journal.pone.0266910
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