Kinematic Event Sequencing in Stuttering Adults: Speech, Orofacial Non Speech, and Finger Movements

Ludo Max1,3, Vincent L. Gracco2,3, and Anthony J. Caruso4
1University of Connecticut, Department of Communication Sciences, 850 Bolton Road Unit 1085, Storrs, CT 06269-1085, USA
2McGill University, School of Communication Sciences and Disorders, 1266 Pine Avenue West, Montreal, Quebec, H3G 1A8, Canada
3Haskins Laboratories, 2 70 Crown Street, New Haven, CT 0651] -6695, USA
4Kent State University, School of Speech Pathology and Audiology, Kent, OH44242-001, USA


Lip and jaw speech movements, lip and jaw nonspeech movements, and finger movements were analyzed to examine whether stuttering adults with no recent speech therapy differ from nonstuttering adults in the sequencing of peak velocity across effectors. Number of movements within a trial and location of the target movements within a trial were experimentally manipulated. Sequencing patterns for stuttering and nonstuttering individuals were similar for two movement types (closing/flexion and opening/extension) in all conditions of the three tasks. Specifically, the order of the most frequently used sequencing patterns was identical for the groups in each task. We conclude that intragestural motor timing as examined here is not impaired in adults who stutter.
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