Despite significant advancement in our understanding of the phonation process in general, it still remains unclear how changes in individual geometrical and material properties of the vocal system affect vocal fold vibration and voice production. Our current understanding of phonation is largely based on results obtained from lumped-mass or other simplified phonatory models. These models have successfully identified key elements and features of phonation. However, parameters that are central to these models often cannot be directly measured or easily related to the anatomical structure or material properties of the vocal folds. Due to this lack of correspondence between model parameters and realistic, directly measurable properties of the vocal folds, direct translation of model-derived findings to clinical applications has been problematic. As a result, speech-language pathologists and surgeons often must rely heavily on experience and their subjective impressions of vibratory pattern to diagnose and treat voice disorders. The long-term goal of the proposed research is to establish a direct link between the underlying geometrical and material properties of the vocal folds and the resulting vocal fold vibration, acoustics, and voice quality. The two main questions to be addressed are: 1) How do changes in the geometrical and material properties of the vocal folds, due to either pathologies or surgical procedures, affect vocal fold vibration and voice quality? and 2) What features of the vocal fold vibration are physically related to the geometrical and material properties of the vocal folds and therefore useful for diagnosis of voice disorders and their ultimate management? Over a five-year period, we propose to answer these two main questions by addressing the following three Specific Aims: 1) Determine the influence of vocal fold geometrical and material properties on the resulting vocal fold vibration, acoustics, and voice quality;2) Quantify the influence of left-right asymmetries in vocal fold geometrical and material properties on the resulting vocal fold vibration, acoustics, and voice quality;3) Determine the influence of localized changes in vocal fold properties on the resulting vocal fold vibration, acoustics, and voice quality.
Successful completion of the proposed research will provide a theoretical framework linking the geometrical and material properties of the vocal folds to vocal fold vibration, acoustics, and voice quality. In the future, this knowledge may be applied in the development of clinical tools that help surgeons and speech-language pathologists in the management of various voice disorders.
|Zhang, Zhaoyan (2016) Respiratory Laryngeal Coordination in Airflow Conservation and Reduction of Respiratory Effort of Phonation. J Voice 30:760.e7-760.e13|
|Signorello, Rosario; Zhang, Zhaoyan; Gerratt, Bruce et al. (2016) Impact of Vocal Tract Resonance on the Perception of Voice Quality Changes Caused by Varying Vocal Fold Stiffness. Acta Acust United Acust 102:209-213|
|Zhang, Zhaoyan (2016) Cause-effect relationship between vocal fold physiology and voice production in a three-dimensional phonation model. J Acoust Soc Am 139:1493|
|Tse, Justin R; Zhang, Zhaoyan; Long, Jennifer L (2015) Effects of vocal fold epithelium removal on vibration in an excised human larynx model. J Acoust Soc Am 138:EL60-4|
|Zhang, Zhaoyan; Chhetri, Dinesh K; Bergeron, Jennifer L (2015) Effects of implant stiffness, shape, and medialization depth on the acoustic outcomes of medialization laryngoplasty. J Voice 29:230-5|
|Zhang, Zhaoyan (2015) Regulation of glottal closure and airflow in a three-dimensional phonation model: implications for vocal intensity control. J Acoust Soc Am 137:898-910|
|Yin, Jun; Zhang, Zhaoyan (2014) Interaction between the thyroarytenoid and lateral cricoarytenoid muscles in the control of vocal fold adduction and eigenfrequencies. J Biomech Eng 136:|
|Xuan, Yue; Zhang, Zhaoyan (2014) Influence of embedded fibers and an epithelium layer on the glottal closure pattern in a physical vocal fold model. J Speech Lang Hear Res 57:416-25|
|Zhang, Zhaoyan (2014) The influence of material anisotropy on vibration at onset in a three-dimensional vocal fold model. J Acoust Soc Am 135:1480-90|
|Mendelsohn, Abie H; Xuan, Yue; Zhang, Zhaoyan (2014) Voice outcomes following laser cordectomy for early glottic cancer: a physical model investigation. Laryngoscope 124:1882-6|
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