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Shaping by stiffening: a modeling study for lips.

Mohammad A Nazari1, Pascal Perrier, Matthieu Chabanas

  • 1ICP/GIPSA-laboratory, UMR CNRS 5216, Saint Martin d'Hères Cedex, France.

Motor Control
|February 23, 2011
PubMed
Summary
This summary is machine-generated.

Muscle stress stiffening significantly impacts lip shape during speech, affecting lip geometry and sound production for the French vowel /u/. This finding has implications for understanding motor control in speech.

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Area of Science:

  • Biomechanics
  • Speech Science
  • Physiology

Background:

  • The Orbicularis Oris (OO) muscle is crucial for lip articulation.
  • Muscle stress stiffening is a known physiological phenomenon.
  • Its specific impact on lip shape and speech acoustics is not fully understood.

Purpose of the Study:

  • To investigate the influence of muscle stress stiffening on lip shape.
  • To analyze the effect of Orbicularis Oris (OO) activation on lip geometry.
  • To determine the consequences for speech signal characteristics, specifically the French vowel /u/.

Main Methods:

  • Utilized a finite element biomechanical model of the face.
  • Simulated lip protrusion/rounding using the Orbicularis Oris (OO) muscle.
  • Modeled the stress stiffening effect within the biomechanical framework.

Main Results:

  • Muscle stress stiffening demonstrably influences lip shape.
  • Lip geometry shows saturation effects with increasing OO activation and stiffening.
  • Absence versus presence of stiffening leads to distinct lip shaping outcomes.

Conclusions:

  • Stress stiffening is a key factor in lip articulation for the French vowel /u/.
  • Observed saturation effects provide insights into motor control strategies for lip gestures.
  • Findings contribute to a deeper understanding of the biomechanics of speech production.