![]() ![]() The ability to objectively characterize vocal qualities like spastic, spasmodic, and tremulous may aid in differentiating one from the other, aid in quantifying the severity level, and provide a basis for monitoring the effects of treatments. (1) These characteristics may be found in neurologically and functionally based voice disorders. Strained, strangled, and tremulous vocal qualities may frequently sound similar and be difficult to differentiate. Key Words: Adductor spasmodic dysphonia-Amyotrophic lateral sclerosis-Essential voice tremor. Profiles of the three groups are presented with the significant features that differentiated one from the other. Three groups of subjects (ADSD, ALS, and Tremor) were analyzed by the Motor Speech Profile System (Kay Elemetrics, Lincoln Park, NJ) for fundamental frequency (Fo), standard deviation of Fo, diadochokinetic rate (ddk), standard deviation of ddk, mean intensity and standard deviation of ddk, frequency and amplitude variability in connected speech, and speaking rate in connected speech. ![]() The purpose of this study was to determine if these vocal qualities of neurologic origin could be differentiated on the basis of acoustic and motor speech parameters. Summary: Strained, strangled, and tremulous vocal qualities that are typically seen in adductor spasmodic dysphonia (ADSD), voice tremor (Tremor), and the spastic dysarthria of amyotrophic lateral sclerosis (ALS) may sound similar and be difficult to differentiate. ![]()
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