On the kinematics of articulatory control us a function of stress and rate
Betty Tuller, J. A. Scott Kelso, Katherine Safford Harris · The Journal of the Acoustical Society of America · 1982
In n previous paper that analyzed phase relations among various muscles as a function of speaking rate and syllable stress [Tuller, Kelso, and Harris (1982)], we found that the time of onset of consonant-related activity remained fixed relative to time of onset of activity for flanking vowels, although substantial changes occurred in peak EMG and duration of EMG in individual muscles. This finding suggests that it is the internal timing relations that are preserved invariant across suprasegmental variation. It is not known whether the kinematic structure of the movement trajectories exhibits n pattern that can be interpreted in an analogous way. To this end, we examined subject's productions of b-vowel-consonant-vowel-b utterances where the vowels were either /a/ or /æ/ and the medial consonant either /b,p,v/ or /w/. Two speaking rates and two stress patterns were varied orthogonally. Infrared L.E.D.s were attached to the lips and jaw and monitored, using a modified SELSPOT optical tracking system. Thus far, the kinematics map rather well onto the earlier EMG findings and together provide evidence for relational invariance in articulation. [Work supported by NINCDS and BRSG.]