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Development of speech motor control: Lip movement variability

På svenska

Author

Summary, in English

This study examined variability of lip movements across repetitions of the same utterance as a function of age in Swedish speakers. The specific purpose was to extend earlier findings by examining variability in both phase and amplitude. Subjects were 50 typically developed native Swedish children and adults (28 females, 22 males, aged 5-31 years). Lip movements were recorded during 15-20 repetitions of a short Swedish phrase using three-dimensional articulography. After correction for head movements, the kinematic records were expressed in a maxilla-based coordinate system. Movement onset and offset of the utterance were identified using kinematic landmarks. The Euclidean distance between receivers on the upper and lower lips was calculated and subjected to functional data analysis to assess both phase and amplitude variability. Results show a decrease in both indices as a function of age, with a greater reduction of amplitude variability. There was no difference between males and females for either index. The two indices were moderately correlated with each other, suggesting that they capture different aspects of speech production. Utterance duration also decreased with age, but variability was unrelated to duration. The standard deviation of utterance duration also decreased with age. The present results thus suggest that age related changes in speech motor control continue up until 30 years of age.

Publishing year

2013

Language

English

Pages

4210-4217

Publication/Series

Journal of the Acoustical Society of America

Volume

133

Issue

6

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Other Medical Sciences not elsewhere specified
  • Otorhinolaryngology

Status

Published

Project

  • Thinking in Time: Cognition, Communication and Learning

ISBN/ISSN/Other

  • ISSN: 1520-8524