ArticleJournal of speech, language, and hearing research : JSLHR2026
Kinematic Features of Laryngeal Motor Control in Parkinson's Disease.
Article in Journal of speech, language, and hearing research : JSLHR, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeLaryngeal kinematics were examined under high-speed videoendoscopy to examine laryngeal motor control of persons with Parkinson's disease (PD).
methodA retrospective analysis was performed on 24 people with idiopathic PD and 24 age- and sex-matched controls as they produced repetitions of the utterance /ifi/ at self-induced levels of vocal effort (typical, mild, moderate, and maximum effort). Two kinematic measures of laryngeal motor control were measured during vocal fold adduction: spatiotemporal index (STI; adductory variability across repeated utterances) and asymmetry index (AI; ratio of deceleration to acceleration of adduction). Mixed-effects analysis of variance models were constructed to determine the main effects of group (PD, control), self-induced level of vocal effort, and their interaction.
resultsStatistically significant main effects of group were found for STI, but not AI. No statistically significant effects of vocal effort level or its interaction with group were observed for either measure.
conclusionsLarger STIs in people with PD are consistent with the increased production variability observed in other speech articulators. Neither laryngeal kinematic measure was modulated by vocal effort level. These findings indicate that the STI was sensitive to differences in laryngeal motor control impairment between people with and without PD.
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