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Journal of Speech, Language, and Hearing Research Vol.43 277-286 February 2000.
© American Speech-Language-Hearing Association
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On the Assessment of Stability and Patterning of Speech Movements

Anne Smith 1
Michael Johnson 1
Clare McGillem 1

Lisa Goffman 1
1 Purdue University West Lafayette, IN

asmith{at}purdue.edu

Speech requires the control of complex movements of orofacial structures to produce dynamic variations in the vocal tract transfer function. The nature of the underlying motor control processes has traditionally been investigated by employing measures of articulatory movements, including movement amplitude, velocity, and duration, at selected points in time. An alternative approach, first used in the study of limb motion, is to examine the entire movement trajectory over time. A new approach to speech movement trajectory analysis was introduced in earlier work from this laboratory. In this method, trajectories from multiple movement sequences are time- and amplitude-normalized, and the STI (spatiotemporal index) is computed to capture the degree of convergence of a set of trajectories onto a single, underlying movement template. This research note describes the rationale for this analysis and provides a detailed description of the signal processing involved. Alternative interpolation procedures for time-normalization of kinematic data are also considered.

KEY WORDS: speech production, motor control, movement analysis

Submitted on July 28, 1998
Accepted on July 6, 1999


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