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  Impedance control and its relation to precision in orofacial movement

Laboissière, R., Lametti, D. R., & Ostry, D. J. (2009). Impedance control and its relation to precision in orofacial movement. Journal of Neurophysiology, 102(1), 523-531. doi:10.1152/jn.90948.2008.

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Genre: Zeitschriftenartikel

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 Urheber:
Laboissière, Rafael1, 2, 3, Autor           
Lametti, Daniel R.4, Autor
Ostry, David. J.4, 5, Autor
Affiliations:
1Institut National de la Santé et de la Recherche Médicale, Espace et Action, Paris, France, ou_persistent22              
2Université Claude Bernard, Lyon 1, Institut Fédératif de Recherche des Neurosciences de Lyon, Institut Fédératif de Recherche sur le Handicap, Unité Mixte de Recherche, Bron, France, ou_persistent22              
3Research Group Sensorimotor Coordination, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634571              
4Department of Psychology, McGill University, Montreal, QC, Canada, ou_persistent22              
5Haskins Laboratories, New Haven, CT, USA, ou_persistent22              

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Schlagwörter: Adolescent; Adult; Analysis of Variance; Biomechanics; Female; Fourier Analysis; Humans; Jaw; Male; Models, Biological; Mouth; Movement; Robotics; Speech; Young Adult
 Zusammenfassung: Speech production involves some of the most precise and finely timed patterns of human movement. Here, in the context of jaw movement in speech, we show that spatial precision in speech production is systematically associated with the regulation of impedance and in particular, with jaw stiffness - a measure of resistance to displacement. We estimated stiffness and also variability during movement using a robotic device to apply brief force pulses to the jaw. Estimates of stiffness were obtained using the perturbed position and force trajectory and an estimate of what the trajectory would be in the absence of load. We estimated this "reference trajectory" using a new technique based on Fourier analysis. A moving-average (MA) procedure was used to estimate stiffness by modeling restoring force as the moving average of previous jaw displacements. The stiffness matrix was obtained from the steady state of the MA model. We applied this technique to data from 31 subjects whose jaw movements were perturbed during speech utterances and kinematically matched nonspeech movements. We observed systematic differences in stiffness over the course of jaw-lowering and jaw-raising movements that were correlated with measures of kinematic variability. Jaw stiffness was high and variability was low early and late in the movement when the jaw was elevated. Stiffness was low and variability was high in the middle of movement when the jaw was lowered. Similar patterns were observed for speech and nonspeech conditions. The systematic relationship between stiffness and variability points to the idea that stiffness regulation is integral to the control of orofacial movement variability. Copyright © 2009 The American Physiological Society.

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Sprache(n): eng - English
 Datum: 2008-08-212009-05-042009-07-012009-07-01
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 450808
Anderer: P10521
DOI: 10.1152/jn.90948.2008
PMID: 19420122
PMC: PMC2712273
 Art des Abschluß: -

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Projektname : -
Grant ID : DC-04669, HD-048924
Förderprogramm : -
Förderorganisation : National Institutes of Health (NIH)

Quelle 1

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Titel: Journal of Neurophysiology
  Andere : J. Neurophysiol.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Bethesda, MD : The Society
Seiten: - Band / Heft: 102 (1) Artikelnummer: - Start- / Endseite: 523 - 531 Identifikator: ISSN: 0022-3077
CoNE: https://pure.mpg.de/cone/journals/resource/954925416959