14th International Congress of Phonetic Sciences (ICPhS-14)

San Francisco, CA, USA
August 1-7, 1999

Flexibility and Stability in Bilabial Gestures: 1) Evidence from Discrete Syllable Production

Peter J. Alfonso (1), Pascal van Lieshout (2)

(1) University of Illinois at Urbana-Champaign, USA
(2) University of Toronto, Canada

In a non-linear dynamical framework, degrees of freedom are controlled by means of self-organization, giving rise to so-called coordinative structures, in which the actions of the individual articulators are constrained with respect to their gestural target (e.g., bilabial closure). The constraints are task-specific and allow for a type of coupling in which the system can adapt quickly to varying input conditions (i.e., flexibility) but perform a given task in a relatively stable and predictable manner (i.e. stability). We examine flexibility and stability in lip closure gestures by calculating the variability associated with lip latencies and sequence patterns, and across different sessions. While the nature of the coupling can vary across sessions, closure gestures with longer time lags between velocity peaks generally are less variable than more symmetric gestures.

Full Paper

Bibliographic reference.  Alfonso, Peter J. / Lieshout, Pascal van (1999): "Flexibility and stability in bilabial gestures: 1) evidence from discrete syllable production", In ICPhS-14, 49-52.