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Brain, Vol. 111, No. 2, 439-455, 1988
© 1988 Oxford University Press

research-article

KINEMATIC ANALYSIS OF MULTIPLE MOVEMENT COORDINATION DURING SPEECH IN STUTTERERS

ANTHONY J. CARUSO1,4, JAMES H. ABBS1,2 and VINCENT L. GRACCO1

1the Speech Motor Control Laboratories, Wasiman Center, Madison, Wisconsin, USA 2Department of Neurology and Neurophysiology, Clinical Science Center, University of Wisconsin Madison, Wisconsin, USA

Correspondence to: 4Current affiliation and address for correspondence: Dr Anthony J. Caruso. National Institute of Dental Research, CIPCB, National Institutes of Health, Building 10. Room 6S255, Bethesda, MD 20892, USA

This study addresses the long-standing claim that stuttering reflects an impairment in the neuromotor coordination of multiple speech movements. Upper lip (UL), lower lip (LL), and jaw (J) kinematics for nonstuttered speech behaviours in stutterers and normal speakers were examined using quan titative indices of normal multiple movement coordination reported in recent studies of gait, reaching, grasping, and speech. While two measures of coordination - dynamic movement composition and intermovement motor equivalence - did not distinguish between stutterers and normals, stutterers manifested striking differences from normal on a third measure, the sequencing of UL, LL, and J movement onsets and velocity peaks. These findings suggest that, contrary to previous hypotheses, stutterersdo not manifest general problems of coordination of speech movement. Instead, stuttering appears to be associated with a specific impairment in multiple movement coordination associated with sequencing of those movements.

Received March 17, 1987. Revised July 21, 1987. Accepted August 13, 1987.


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