Tongue-jaw displacement variability in the fluent speech of stutterers and control subjects

The x-ray microbeam installation at the University of Tokyo was used to compare supralaryngeal kinematic patterns of fluent utterances produced by a control subject and two stutterers. For the control subject, trial-to-trial variability in individual and combined tongue-jaw peak displacement for alv...

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Veröffentlicht in:The Journal of the Acoustical Society of America 1987-05, Vol.81 (S1), p.S56-S56
Hauptverfasser: Alfonso, P. J., Watson, B. C., Story, R.
Format: Artikel
Sprache:eng
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Zusammenfassung:The x-ray microbeam installation at the University of Tokyo was used to compare supralaryngeal kinematic patterns of fluent utterances produced by a control subject and two stutterers. For the control subject, trial-to-trial variability in individual and combined tongue-jaw peak displacement for alveolar obstruent closure and release was equivalent to the variability in lip and jaw displacement for bilabial stop closure and release by a larger group of normal subjects [V. L. Gracco and J. H. Abbs, Exp. Brain Res. (in press)]. The stutterers demonstrated greater variability than the control in individual tongue and jaw displacement, and the combined tongue-jaw displacement variability was not less than the individual articulator variability. In contrast to the control, the stutterers achieved closure and release primarily by jaw displacement with little, and occasionally paradoxical, tongue displacement. The lack of covariability in tongue-jaw displacement, coupled with the dominance of a single member of an articulator complex, suggests that stutterers lack the same degree of precision and flexibility observed in normal speech motor systems to efficiently meet invariant object-level goals. [Work supported by NIH NS-13617.]
ISSN:0001-4966
1520-8524
DOI:10.1121/1.2024299