Coarticulation and the accented/unaccented distinction: evidence from jaw movement data

Abstract

Both coproduction and the more recent task dynamic models ofspeech production have advanced an explanation for certain kinds of vowel shortening in terms of coarticulatory overlap between neighbouring speech sounds. In this study, the extent to which coarticulatory overlap between opening and closing jaw movement gestures accompanies the accented/unaccented vowel distinction is considered. The authors begin by quantifying the salient differences between truncation, which is caused by a close phasing of articulatory gestures, and linear rescaling of jaw movements. In both truncation and linear rescaling, the duration and amplitude of movement decrease, and the peak velocities remain the same:..