Jäncke, L., Bauer, A., Haakert, O. & Kalveram, K.Th. (1995) Patterns of interarticulator phasing relations in stutterers and nonstutterers. In C.W. Starkweather & H.F.M. Peters (Hrsg.), Proceedings of the First World Congress on Fluency Disorders. 23-26.
Abstract
Twelve nonstutterers and nineteen stutterers were asked to utter the testword /papapas/ under different stress and speech rate conditions. Contrary to earlier reports which suggested an invariant UL-LL-J peak velocity sequence in normal speakers and a more variant pattern in stutterers, we found that nonstutterers as well as stutterers failed to show an invariant peak velocity sequence for bilabial closure and that stutterers and nonstutterers exhibited almost the same distribution of peak velocity sequences. Additionally, we computed phase angle positions of upper lip closure eith respect to the jaw movement cycle for a subset of the investigated subset and found neither a difference in these phase angel positions nor any difference with respect to the variability of these phase angle positions. The present results reveal strong intra- and interindividual variability in peak velocity patterns and phase angle positions leading to the conclusion that neither a deviation from the UL-LL-J peak velocity sequence nor a deviant pattern of phase angle positions is likely to be an indicator of a disturbed speech motor control process in stutterers. However, we found that stutterers tended to show a larger intraindividual variability for the intonationand termination of phonation with respect to the jaw phase plane, likely pointing to a deviant control of the initiation and termiantion of phonation.

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