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Related Experiment Videos

Intrinsic and extrinsic timing in stutterers' speech: data and implications

D Ward1

  • 1Department of Linguistic Science, University of Reading, U.K. LLswadav@reading.ac.uk

Language and Speech
|July 1, 1997
PubMed
Summary

Stutterers show greater variability in speech timing, especially at faster rates or altered stress. This challenges the idea that phase angle analyses solely reflect intrinsic timing mechanisms in speech motor control.

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Area of Science:

  • Speech motor control
  • Linguistics
  • Neurology

Background:

  • Understanding speech timing is crucial for explaining fluency and stuttering.
  • Extrinsic and intrinsic timing models offer different perspectives on speech motor control.

Purpose of the Study:

  • To investigate interarticulator timing differences between stutterers and non-stutterers.
  • To evaluate extrinsic and intrinsic timing models of speech production using an oral closure task.

Main Methods:

  • Analysis of peak velocity sequence profiles and sequence periods for upper lip, lower lip, and jaw.
  • Phase portrait analyses to model intrinsic timing theory.
  • Comparison of timing variability across different speech rates, stress patterns, and vowel contexts.

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Main Results:

  • Stutterers exhibited significantly greater phase angle variability compared to non-stutterers.
  • Increased variability was observed at faster articulatory rates and with altered stress patterns.
  • No group differences in peak velocity sequencing, but sequence period data partially aligned with phase angle findings.

Conclusions:

  • Phase angle variability in stutterers suggests potential disruptions in intrinsic timing mechanisms.
  • Findings question the exclusive interpretation of phase angle analyses as purely intrinsic timing phenomena.
  • Interarticulator timing variability in stuttering is influenced by rate and stress, impacting speech motor control models.