Triangular body-cover model of the vocal folds with coordinated activation of the five intrinsic laryngeal muscles
This work addresses the need for accurate models to investigate non-phonotraumatic vocal hyperfunction and other laryngeal motor control disorders, which is incremental as it builds on existing low-order models.
The researchers tackled the problem of modeling vocal fold biomechanics to test hypotheses about voice disorders, by introducing a triangular body-cover model with full intrinsic muscle control that shows good agreement with prior studies and yields clear differences in kinematic, aerodynamic, and acoustic measures in simulations.
Poor laryngeal muscle coordination that results in abnormal glottal posturing is believed to be a primary etiologic factor in common voice disorders such as non-phonotraumatic vocal hyperfunction. Abnormal activity of antagonistic laryngeal muscles is hypothesized to play a key role in the alteration of normal vocal fold biomechanics that results in the dysphonia associated with such disorders. Current low-order models of the vocal folds are unsatisfactory to test this hypothesis since they do not capture the co-contraction of antagonist laryngeal muscle pairs. To address this limitation, a self-sustained triangular body-cover model with full intrinsic muscle control is introduced. The proposed scheme shows good agreement with prior studies using finite element models, excised larynges, and clinical studies in sustained and time-varying vocal gestures. Simulations of vocal fold posturing obtained with distinct antagonistic muscle activation yield clear differences in kinematic, aerodynamic and acoustic measures. The proposed tool is deemed sufficiently accurate and flexible for future comprehensive investigations of non-phonotraumatic vocal hyperfunction and other laryngeal motor control disorders.