Spastic/spasmodic vs. tremulous vocal quality: Motor speech profile analysis

Donna S. Lundy, Soham Roy, Jun W. Xue, Roy R. Casiano, Daniel Jassir

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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. 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. 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. Profiles of the three groups are presented with the significant features that differentiated one from the other.

Original languageEnglish (US)
Pages (from-to)146-152
Number of pages7
JournalJournal of Voice
Issue number1
StatePublished - Mar 1 2004


  • Adductor spasmodic dysphonia
  • Amyotrophic lateral sclerosis
  • Essential voice tremor

ASJC Scopus subject areas

  • Otorhinolaryngology


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