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Lip muscle activity related to speech rate and loudness.

A B Wohlert1, V L Hammen

  • 1Purdue University, West Lafayette, IN, USA. awohlert@unm.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|November 4, 2000
PubMed
Summary

Speech rate and loudness significantly alter perioral muscle activity. Faster, louder, and precise speech increases muscle engagement, while slower, softer speech decreases it, indicating motor control adjustments.

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Area of Science:

  • Speech Science
  • Motor Control
  • Electromyography

Background:

  • Suprasegmental speech changes, like rate and loudness, influence oral motor control.
  • Perioral musculature activity reflects these motor control adjustments.

Purpose of the Study:

  • To investigate how variations in speech rate, loudness, and precision affect perioral muscle activity.
  • To identify patterns of difference in electromyographic (EMG) signals during connected speech.

Main Methods:

  • Surface electromyography (EMG) was used to record perioral muscle activity.
  • Twenty adults read a paragraph at habitual, slower, and faster rates, and softer, louder, and precise speech levels.
  • EMG amplitude was analyzed for significant task effects.

Main Results:

  • EMG amplitude showed significant differences based on speech tasks.
  • Higher average EMG amplitudes were observed for fast, loud, and precise speech.
  • Lower average EMG amplitudes were found for slow and soft speech.

Conclusions:

  • Speech motor control reorganizes multidimensionally in response to suprasegmental changes in connected speech.
  • Perioral muscle activity patterns support a model of adaptive speech motor control.

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