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Related Experiment Video

Updated: Jun 6, 2026

A Protocol for Comprehensive Assessment of Bulbar Dysfunction in Amyotrophic Lateral Sclerosis (ALS)
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A Protocol for Comprehensive Assessment of Bulbar Dysfunction in Amyotrophic Lateral Sclerosis (ALS)

Published on: February 21, 2011

Long-term phonatory instability in ataxic dysarthria.

Frank Boutsen1, Joseph R Duffy, Hani Dimassi

  • 1University of Oklahoma Health Sciences Center, Oklahoma City, 73117-1215, USA. Frank-Boutsen@ouhsc.edu

Folia Phoniatrica Et Logopaedica : Official Organ of the International Association of Logopedics and Phoniatrics (IALP)
|November 20, 2010
PubMed
Summary

Phonation instability, measured by cyclical and noncyclical metrics, is common in ataxic dysarthria. These measures can reveal phonatory changes in ataxic dysarthria, even in the absence of vocal tremor.

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Published on: February 21, 2011

Area of Science:

  • Speech-language pathology
  • Neurology
  • Biomedical engineering

Background:

  • Phonatory instability can be quantified using cyclical and noncyclical measures.
  • Ataxic dysarthria is a motor speech disorder that can affect phonation.

Purpose of the Study:

  • To evaluate phonation in ataxic dysarthria compared to a normal control group.
  • To determine the prevalence of elevated cyclical and noncyclical instability in ataxic dysarthria.
  • To assess if cyclical instability predicts noncyclical instability.

Main Methods:

  • Vowel prolongations from ataxic-dysarthric and normal speakers were analyzed.
  • The Motor Speech Profile module of the Computerized Speech Lab was utilized.
  • Cyclical measures (tremor rate, amplitude, periodicity) and noncyclical measures (coefficient of variation for loudness and frequency) were assessed.

Main Results:

  • Noncyclical measures were elevated in a subset of ataxic dysarthria speakers, irrespective of vocal tremor.
  • Cyclical instability was detected in nearly half of the patients.
  • Elevated measures were also observed in some participants within the control group.

Conclusions:

  • Combined cyclical and noncyclical measures effectively document phonatory aspects in ataxic dysarthria.
  • These measures have significant clinical implications for understanding and managing the disorder.