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Comparing vowel intelligibility across interactive and non-interactive tasks in disordered speech.

Annie J Olmstead1, Elizabeth Krajewski2, Jimin Lee1

  • 1Department of Communication Sciences and Disorders, The Pennsylvania State University, University Park, Pennsylvania 16803, USA.

JASA Express Letters
|March 16, 2026
PubMed
Summary
This summary is machine-generated.

This study found that clear speech and interactive communication improve vowel intelligibility for people with dysarthria due to amyotrophic lateral sclerosis (ALS). Interactive communication may be even more effective than clear speech for some vowels.

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Area of Science:

  • Speech-language pathology
  • Neurology
  • Linguistics

Background:

  • Individuals with dysarthria secondary to amyotrophic lateral sclerosis (ALS) often exhibit reduced vowel intelligibility.
  • Vowel production in ALS is typically marked by centralization and lowering, impacting speech clarity.

Purpose of the Study:

  • To investigate the impact of interactive versus non-interactive communication contexts on vowel intelligibility in speakers with ALS.
  • To compare vowel intelligibility in habitual speech, clear speech, and interactive matching tasks.

Main Methods:

  • Two experiments were conducted involving listeners identifying vowels produced by people with ALS.
  • Vowels were produced in three conditions: habitual speech (non-interactive), clear speech (non-interactive), and interactive matching.

Main Results:

  • Both clear speech and interactive matching significantly improved vowel intelligibility compared to habitual speech.
  • Interactive matching productions demonstrated equal or greater intelligibility than clear speech productions, varying by vowel.

Conclusions:

  • Communicative interaction dynamics can positively influence vowel intelligibility in dysarthria associated with ALS.
  • Findings suggest that interactive tasks may offer benefits for speech clarity in this population.