The Dynamics of Interlip Coupling in Speakers With a Repaired Unilateral Cleft-Lip History

van Lieshout, Pascal H. H. M.; Rutjens, C. A. W.; Spauwen, P. H. M.
February 2002
Journal of Speech, Language & Hearing Research;Feb2002, Vol. 45 Issue 1, p5
Academic Journal
In this paper, data are presented on individual movement characteristics of the upper and lower lip and on interlip coordination in speakers with a repaired unilateral cleft upper lip history and age-matched control participants. The data were acquired using the AG100 EMMA system while the participants produced a selection of nonspeech and speech tasks. The participants with a repaired unilateral cleft upper lip history showed reduced upper-lip movement ranges and peak velocities and a more variable spatiotemporal pattern for individual upperlip movement cycles, in addition to a more variable interlip coupling. The latter difference also proved to be more pronounced for the younger speakers with a repaired cleft upper lip. Overall, for both groups, the linguistically more complex task showed more variability in the individual upper-and lower-lip movement cycles and their coupling. In the discussion, we address the potential relationships between the kinematic data for upper lip in the repaired-cleft-lip speakers and the findings on movement and coordination stability as they might fit within current notions of coordination dynamics theory.


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