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Impedance control and its relation to precision in orofacial movement
Rafael Laboissière1, Daniel R Lametti, David J Ostry
1Institut National de la Santé et de la Recherche Médicale, U864, Espace et Action, Lyon, France.
Journal of Neurophysiology
|May 8, 2009
Summary
Jaw stiffness, a measure of resistance to displacement, is systematically linked to movement precision during speech. Higher jaw stiffness correlates with lower movement variability, indicating its crucial role in controlling speech movements.
Area of Science:
- Biomechanics of speech production
- Motor control of orofacial movements
Background:
- Speech production requires highly precise and timed movements.
- Jaw movement control is essential for articulation.
Purpose of the Study:
- To investigate the relationship between jaw impedance, specifically stiffness, and spatial precision during speech.
- To determine if stiffness regulation plays a role in the variability of jaw movements during speech.
Main Methods:
- Utilized a robotic device to apply force pulses to the jaw during speech and non-speech movements.
- Estimated jaw stiffness and movement variability using Fourier analysis and a moving-average (MA) model.
- Analyzed data from 31 subjects performing perturbed jaw movements.
Main Results:
- Observed systematic differences in jaw stiffness and kinematic variability throughout jaw movements.
- Found that high jaw stiffness and low variability occurred when the jaw was elevated (early/late movement).
- Found that low jaw stiffness and high variability occurred when the jaw was lowered (mid-movement).
Conclusions:
- Jaw stiffness regulation is integral to controlling orofacial movement variability during speech.
- The observed patterns of stiffness and variability were consistent across speech and non-speech tasks.
- Findings suggest impedance control is a fundamental aspect of precise motor execution in speech.
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