The dynamics of interlip coupling in speakers with a repaired unilateral cleft-lip history.
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 upper-lip 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.
van Lieshout
P H H M
PH
University of Toronto, Graduate Department of Speech-Language Pathology, Oral Dynamics Lab, 6 Queen's Park Crescent West, Toronto, ON M5S 3H2, Canada. p.vanlieshout@utoronto.ca
Rutjens
C A W
CA
Spauwen
P H M
PH
D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D002648:Child; D002971:Cleft Lip / Q000503:physiopathology* / Q000601:surgery; D005152:Facial Muscles; D005260:Female; D006801:Humans; D008046:Lip / Q000502:physiology / Q000503:physiopathology*; D008297:Male; D009068:Movement; D013060:Speech