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Kinematics of repetitive speech in children with speech delay of unknown origin
Lakshmi Venkatesh and Christopher A. Moore

The present investigation was designed to describe the coordinative organization of lips and jaw in children with typical speech acquisition (TS) and children with speech delay (SD) of unknown origin. Movement traces of the lips and jaw were obtained using a video based tracking system during repetitive productions of bilabials. An index of variability was used to quantify the cycle-to-cycle movement variability of the articulators for repeated series of a task within a given trial. The higher value of the variability index observed in the movement of lips and jaw in children with SD were reflective of lower movement stability across repeated cyclic movement patterns. The coordinative organization of the oral articulators is discussed with respect to the role of speech motor control constraints underlying the deficits associated with speech sound delay of unknown origin.

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