Hasini R Weerathunge, Jenny Vojtech, Courtney J Dunsmuir, Sarah J Cocroft, Manuel E Díaz-Cádiz, Victoria McKenna, Cara E Stepp
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Characterization of Vocal Motor Control Using Laryngeal Kinematics in Individuals With Hyperfunctional Voice Disorders.
Purpose: High-speed videoendoscopy was used to investigate how underlying laryngeal motor control strategies differ in individuals with and without hyperfunctional voice disorders (HVDs). Three laryngeal kinematic measures were defined to characterize laryngeal motor control: kinematic stiffness, spatiotemporal index, and asymmetry index.
Method: Twenty-eight adults with HVDs and 28 age- and sex-matched controls produced repeated utterances of /ifi/ at three different gesture rates (50, 65, and 80 beats per minute) and three self-induced vocal effort levels (mild, moderate, and maximum effort) to elicit a range of linguistic contexts for the vocal targets produced. The glottal angle profiles of /ifi/ productions were extracted to calculate three kinematic measures of laryngeal motor control: kinematic stiffness (estimating laryngeal muscle tension), spatiotemporal index (estimating production variability), and asymmetry index (estimating movement asymmetry).
Results: Individuals with HVDs exhibited statistically significantly higher kinematic stiffness during varying effort levels and higher spatiotemporal indices and asymmetry indices compared to controls, indicating higher laryngeal muscle tension, production variability, and movement asymmetry, respectively.
Conclusion: Laryngeal kinematics suggest differing underlying motor control strategies in individuals with HVD relative to controls, which may inform better understanding of the etiology of HVDs.
期刊介绍：
Mission: JSLHR publishes peer-reviewed research and other scholarly articles on the normal and disordered processes in speech, language, hearing, and related areas such as cognition, oral-motor function, and swallowing. The journal is an international outlet for both basic research on communication processes and clinical research pertaining to screening, diagnosis, and management of communication disorders as well as the etiologies and characteristics of these disorders. JSLHR seeks to advance evidence-based practice by disseminating the results of new studies as well as providing a forum for critical reviews and meta-analyses of previously published work.
Scope: The broad field of communication sciences and disorders, including speech production and perception; anatomy and physiology of speech and voice; genetics, biomechanics, and other basic sciences pertaining to human communication; mastication and swallowing; speech disorders; voice disorders; development of speech, language, or hearing in children; normal language processes; language disorders; disorders of hearing and balance; psychoacoustics; and anatomy and physiology of hearing.
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