Coupling Dynamics Interlip Coordination in Lower Lip Load Compensation PurposeTo study the effects of lower lip loading on lower and upper lip movements and their coordination to test predictions on coupling dynamics derived from studies in limb control.MethodMovement data were acquired using electromagnetic midsagittal articulography under 4 conditions: (a) without restrictions, serving as a baseline; (b) with a small ... Supplement
Supplement  |   April 01, 2014
Coupling Dynamics Interlip Coordination in Lower Lip Load Compensation
 
Author Affiliations & Notes
  • Pascal van Lieshout
    University of Toronto, Ontario, Canada
    Toronto Rehabilitation Institute
  • Chris Neufeld
    University of Toronto, Ontario, Canada
  • Disclosure:The authors have declared that no competing interests existed at the time of publication.
    Disclosure:The authors have declared that no competing interests existed at the time of publication.×
  • Correspondence to Pascal van Lieshout: p.vanlieshout@utoronto.ca
  • Editor: Jody Kreiman
    Editor: Jody Kreiman×
  • Associate Editor: Jeffrey Berry
    Associate Editor: Jeffrey Berry×
Article Information
Speech, Voice & Prosody / Supplement
Supplement   |   April 01, 2014
Coupling Dynamics Interlip Coordination in Lower Lip Load Compensation
Journal of Speech, Language, and Hearing Research, April 2014, Vol. 57, S597-S615. doi:10.1044/2014_JSLHR-S-12-0207
History: Received June 29, 2012 , Revised March 1, 2013 , Accepted September 16, 2013
 
Journal of Speech, Language, and Hearing Research, April 2014, Vol. 57, S597-S615. doi:10.1044/2014_JSLHR-S-12-0207
History: Received June 29, 2012; Revised March 1, 2013; Accepted September 16, 2013
Web of Science® Times Cited: 1

PurposeTo study the effects of lower lip loading on lower and upper lip movements and their coordination to test predictions on coupling dynamics derived from studies in limb control.

MethodMovement data were acquired using electromagnetic midsagittal articulography under 4 conditions: (a) without restrictions, serving as a baseline; (b) with a small carrier device attached to the lower lip; (c) with a 50-g weight added to the device; and, at the end of the session (d) with the weight and device removed. For all conditions, 8 participants repeated nonwords at 2 speaking rates. Movement data were used to derive discrete kinematic measures, a cyclic index of spatiotemporal variability, phase deviations, and standard deviations of relative phase for interlip coupling.

ResultsKinematic variables were not systematically affected by lower lip load. Phase deviations also showed no change, but in contrast, phase variability showed a significant increase for the lower lip load condition at fast rates.

ConclusionLower lip load effects are comparable to the reported impact of homologous limb loading, showing evidence for a tight coupling between both lips in line with predictions from coordination dynamics accounts in the literature.

Acknowledgments
This study was undertaken with support of the Natural Sciences and Engineering Research Council and in part by the Canada Research Chairs Program, both awarded to the first author. The authors wish to thank Prasan Parikh for his valuable help in analyzing the kinematic data for this study and Aravind Namasivayam for his overall support of this project.
Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access