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Variability in muscle activation of simple speech motions: A biomechanical modeling approach.
- Source :
-
The Journal of the Acoustical Society of America [J Acoust Soc Am] 2017 Apr; Vol. 141 (4), pp. 2579. - Publication Year :
- 2017
-
Abstract
- Biomechanical models of the oropharynx facilitate the study of speech function by providing information that cannot be directly derived from imaging data, such as internal muscle forces and muscle activation patterns. Such models, when constructed and simulated based on anatomy and motion captured from individual speakers, enable the exploration of inter-subject variability of speech biomechanics. These models also allow one to answer questions, such as whether speakers produce similar sounds using essentially the same motor patterns with subtle differences, or vastly different motor equivalent patterns. Following this direction, this study uses speaker-specific modeling tools to investigate the muscle activation variability in two simple speech tasks that move the tongue forward (/ə-ɡis/) vs backward (/ə-suk/). Three dimensional tagged magnetic resonance imaging data were used to inversely drive the biomechanical models in four English speakers. Results show that the genioglossus is the workhorse muscle of the tongue, with activity levels of 10% in different subdivisions at different times. Jaw and hyoid positioners (inferior pterygoid and digastric) also show high activation during specific phonemes. Other muscles may be more involved in fine tuning the shapes. For example, slightly more activation of the anterior portion of the transverse is found during apical than laminal /s/, which would protrude the tongue tip to a greater extent for the apical /s/.
- Subjects :
- Adult
Biomechanical Phenomena
Female
Humans
Magnetic Resonance Imaging, Cine
Male
Muscle, Skeletal diagnostic imaging
Phonation
Pterygoid Muscles diagnostic imaging
Pterygoid Muscles physiology
Tongue diagnostic imaging
Young Adult
Motor Activity
Muscle, Skeletal physiology
Speech
Tongue physiology
Voice
Subjects
Details
- Language :
- English
- ISSN :
- 1520-8524
- Volume :
- 141
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- The Journal of the Acoustical Society of America
- Publication Type :
- Academic Journal
- Accession number :
- 28464688
- Full Text :
- https://doi.org/10.1121/1.4978420