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Human perioral muscle activation patterns

A B Wohlert1, L Goffman

  • 1Department of Audiology and Speech Sciences, Purdue University, West Lafayette, IN.

Journal of Speech and Hearing Research
|October 1, 1994
PubMed
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The human perioral muscles flexibly organize for different tasks. Motor coupling patterns varied significantly between lip protrusion, chewing, and speech, showing task-dependent neural control of oral movements.

Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • The perioral region's motor control is crucial for functions like speech and mastication.
  • Understanding the neural organization of perioral muscles provides insights into motor planning and execution.

Purpose of the Study:

  • To investigate task-dependent motor organization in the human perioral region.
  • To determine patterns of motor coupling among perioral muscles during various oral tasks.

Main Methods:

  • Eight healthy adults performed lip protrusion, chewing, and speech tasks.
  • Electromyography (EMG) signals were recorded from lip quadrants.
  • Zero phase-lag correlations analyzed motor coupling patterns.

Main Results:

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  • Perioral musculature demonstrated flexible output organization.
  • High positive correlations among all quadrants during lip protrusion.
  • Moderate correlations during chewing, with stronger bilateral patterns.
  • Lower correlations during speech, but with stronger bilateral than ipsilateral coupling.

Conclusions:

  • The perioral motor system exhibits adaptable organization based on task demands.
  • Findings support hypotheses regarding cortical control patterns for oral movements.
  • Results contribute to understanding the neural basis of complex oral behaviors.