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Development of speech motor control: Lip movement variability

Schötz, Susanne LU ; Frid, Johan LU and Löfqvist, Anders LU (2013) In Journal of the Acoustical Society of America 133(6). p.4210-4217
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Acoustical Society of America
volume
133
issue
6
pages
4210 - 4217
publisher
American Institute of Physics
external identifiers
  • WOS:000320173600061
  • PMID:23742372
  • Scopus:84878931116
ISSN
1520-8524
DOI
10.1121/1.4802649
project
Cognition, Communication and Learning
language
English
LU publication?
yes
id
0165cb95-f23f-4545-90ec-4f3e88800350 (old id 3626963)
date added to LUP
2013-04-03 11:08:31
date last changed
2017-03-19 03:40:26
@article{0165cb95-f23f-4545-90ec-4f3e88800350,
  abstract     = {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.},
  author       = {Schötz, Susanne and Frid, Johan and Löfqvist, Anders},
  issn         = {1520-8524},
  language     = {eng},
  number       = {6},
  pages        = {4210--4217},
  publisher    = {American Institute of Physics},
  series       = {Journal of the Acoustical Society of America},
  title        = {Development of speech motor control: Lip movement variability},
  url          = {http://dx.doi.org/10.1121/1.4802649},
  volume       = {133},
  year         = {2013},
}