On the Assessment of Stability and Patterning of Speech Movements

Anne Smith, Michael Johnson, Clare McGillem, Lisa Goffman

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


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.

Original languageEnglish
Pages (from-to)277-286
Number of pages10
JournalJournal of Speech, Language, and Hearing Research
Issue number1
StatePublished - Feb 2000


  • Motor control
  • Movement analysis
  • Speech production

ASJC Scopus subject areas

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing


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