Affordable Access

deepdyve-link
Publisher Website

The Morphogenesis of Speech Gestures: From Local Computations to Global Patterns.

Authors
  • Iskarous, Khalil1
  • 1 Department of Linguistics, University of Southern California, Los Angeles, CA, United States. , (United States)
Type
Published Article
Journal
Frontiers in Psychology
Publisher
Frontiers Media SA
Publication Date
Jan 01, 2019
Volume
10
Pages
2395–2395
Identifiers
DOI: 10.3389/fpsyg.2019.02395
PMID: 31780980
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

A subtle property of speech gestures is the fact that they are spatially and temporally extended, meaning that phonological contrasts are expressed using spatially extended constrictions, and have a finite duration. This paper shows how this spatiotemporal particulation of the vocal tract, for the purpose of linguistic signaling, comes about. It is argued that local uniform computations among topographically organized microscopic units that either constrict or relax individual points of the vocal tract yield the global spatiotemporal macroscopic structures we call constrictions, the locus of phonological contrast. The dynamical process is a morphogenetic one, based on the Turing and Hopf patterns of mathematical physics and biology. It is shown that reaction-diffusion equations, which are introduced in a tutorial mathematical style, with simultaneous Turing and Hopf patterns predict the spatiotemporal particulation, as well as concrete properties of speech gestures, namely the pivoting of constrictions, as well as the intermediate value of proportional time to peak velocity, which is well-studied and observed. The goal of the paper is to contribute to Bernstein's program of understanding motor processes as the emergence of low degree of freedom descriptions from high degree of freedom systems by actually pointing to specific, predictive, dynamics that yield speech gestures from a reaction-diffusion morphogenetic process. Copyright © 2019 Iskarous.

Report this publication

Statistics

Seen <100 times