Asymmetric triangular body-cover model of the vocal folds with bilateral intrinsic muscle activation.

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  • Additional Information
    • Source:
      Publisher: American Institute of Physics Country of Publication: United States NLM ID: 7503051 Publication Model: Print Cited Medium: Internet ISSN: 1520-8524 (Electronic) Linking ISSN: 00014966 NLM ISO Abbreviation: J Acoust Soc Am Subsets: MEDLINE
    • Publication Information:
      Publication: Melville, NY : American Institute of Physics
      Original Publication: Lancaster, Pa. [etc.] : American Institute of Physics for the Acoustical Society of America
    • Subject Terms:
      Vocal Cords*/physiology ; Vocal Cords*/physiopathology ; Vibration* ; Laryngeal Muscles*/physiology ; Laryngeal Muscles*/physiopathology ; Phonation*; Humans ; Computer Simulation ; Dysphonia/physiopathology ; Vocal Cord Paralysis/physiopathology ; Models, Biological ; Biomechanical Phenomena
    • Abstract:
      Many voice disorders are linked to imbalanced muscle activity and known to exhibit asymmetric vocal fold vibration. However, the relation between imbalanced muscle activation and asymmetric vocal fold vibration is not well understood. This study introduces an asymmetric triangular body-cover model of the vocal folds, controlled by the activation of bilateral intrinsic laryngeal muscles, to investigate the effects of muscle imbalance on vocal fold oscillation. Various scenarios were considered, encompassing imbalance in individual muscles and muscle pairs, as well as accounting for asymmetry in lumped element parameters. Measurements of amplitude and phase asymmetries were employed to match the oscillatory behavior of two pathological cases: unilateral paralysis and muscle tension dysphonia. The resulting simulations exhibit muscle imbalance consistent with expectations in the composition of these voice disorders, yielding asymmetries exceeding 30% for paralysis and below 5% for dysphonia. This underscores the relevance of muscle imbalance in representing phonatory scenarios and its potential for characterizing asymmetry in vocal fold vibration.
      (© 2024 Acoustical Society of America.)
    • Comments:
      Update of: bioRxiv. 2024 Mar 20:2024.03.18.585590. doi: 10.1101/2024.03.18.585590. (PMID: 38562893)
    • Publication Date:
      Date Created: 20240812 Date Completed: 20240812 Latest Revision: 20240820
    • Publication Date:
      20240820
    • Accession Number:
      10.1121/10.0028164
    • Accession Number:
      39133633