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Tongue-surface movement patterns during speech and swallowing.

Jordan R Green1, Yu-Tsai Wang

  • 1Department of Communicative Disorders, University of Wisconsin-Madison, 1975 Willow Drive, Madison, Wisconsin 53706, USA.

The Journal of the Acoustical Society of America
|May 27, 2003
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Summary

This study reveals distinct tongue movement patterns during speech and swallowing. Analysis of tongue coupling demonstrates functional independence in anterior tongue regions, crucial for understanding speech articulation.

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Area of Science:

  • Linguistics
  • Biomechanics
  • Speech Science

Background:

  • The tongue is often viewed as multiple independent articulators.
  • Understanding tongue's functional regionality is key for speech production and swallowing research.

Purpose of the Study:

  • To quantify the coupling strength among four tongue locations.
  • To differentiate tongue movement patterns during speech versus swallowing.
  • To investigate functional regionality within the tongue.

Main Methods:

  • Utilized the x-ray microbeam database to track vertical displacements of pellets on the tongue.
  • Analyzed tongue movements from 46 participants reciting vowel-consonant-vowel (VCV) utterances and swallowing water.
  • Computed covariance between vertical time-histories of pellet pairs to quantify movement coupling.

Main Results:

  • Observed predictable variations in tongue coupling strength with place of articulation, indicating phonemic differentiation.
  • Tongue displacements during speech and swallowing formed distinct clusters based on coupling profiles.
  • Demonstrated functional independence of anterior tongue regions through diverse coupling relations.

Conclusions:

  • Tongue movement coupling analysis effectively characterizes speech and swallowing behaviors.
  • Evidence supports functional regionality within the tongue, particularly anterior independence.
  • Covariance analysis provides a robust method for studying tongue biomechanics.