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Related Experiment Videos

Acoustic differences between content and function words in amyotrophic lateral sclerosis.

G S Turner1, K Tjaden

  • 1Department of Communication Disorders, Central Missouri State University, Warrensburg, USA.

Journal of Speech, Language, and Hearing Research : JSLHR
|July 6, 2000
PubMed
Summary
This summary is machine-generated.

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Speech acoustics in amyotrophic lateral sclerosis (ALS) show subtle vowel differences between content and function words. Temporal speech properties, not spectral, better predict impairment, suggesting therapy targets.

Area of Science:

  • Speech Science
  • Neurology
  • Linguistics

Background:

  • Dysarthria in amyotrophic lateral sclerosis (ALS) impacts speech intelligibility.
  • Acoustic analysis of speech can elucidate these intelligibility deficits.

Purpose of the Study:

  • To investigate acoustic vowel distinctions in content vs. function words for speakers with ALS.
  • To correlate speech impairment in ALS with acoustic vowel differences.

Main Methods:

  • Nine speakers with mild-to-moderate ALS and nine controls produced vowels /i/, /ae/, /u/, /a/ in content and function words.
  • Measured F1/F2 frequencies, vowel space area, and vowel durations.
  • Analyzed differences between word types and their relation to speech impairment.

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Main Results:

  • No significant differences in spectral or duration vowel variations between ALS speakers and controls.
  • ALS speakers showed a trend towards smaller vowel space area differences between word types.
  • Temporal differences in vowel production were stronger predictors of speech impairment than spectral differences.

Conclusions:

  • Individuals with ALS may not acoustically distinguish vowels in content vs. function words as much as controls.
  • Therapeutic interventions for ALS speech should prioritize temporal acoustic features.