(1)įor most of its clinical history, adductor spasmodic dysphonia (ASD) was considered a psy-chogenic disorder because of the apparent absence of structural or mucosal abnormalities of the vo-cal folds. Current literature offers several etiologies, symptoms and treatments of/for laryngeal dystonia since it was first described in 1871 as a form of "nervous hoarseness". Laryngeal dystonia is a devastating voice disorder of essentially unknown etiology. Tremor extent for intensity was significantly higher and significant variability of the signal around the fundamental was noted within the ASD group. No significant difference in F0 tremor rates was found.
Ab-normal vocal tremor was found in 66.7% of the ASD patients and the mean intensity tremor rate was significantly higher than for the ASD group. Voice recordings were analyzed for 30 ASD patients and 60 control group subjects (without vocal or neurologic pathology). This study aimed to acoustically define vocal tremor in ASD patients. How-ever, little is known about the prevalence or acoustic nature of the tremor in these patients. Patients with adductor spasmodic dysphonia (ASD) have an associated vocal tremor. Department of Otolaryngology - Head and Neck Surgery,
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