Modeling Tongue Surface Contours From Cine-MRI Images This study demonstrated that a simple mechanical model of global tongue movement in parallel sagittal planes could be used to quantify tongue motion during speech. The goal was to represent simply the differences in 2D tongue surface shapes and positions during speech movements and in subphonemic speech events such as ... Research Article
Research Article  |   October 01, 2001
Modeling Tongue Surface Contours From Cine-MRI Images
 
Author Affiliations & Notes
  • Maureen Stone
    Departments of Oral and Craniofacial Biological Sciences and Orthodontics University of Maryland Dental School Baltimore
  • Edward P. Davis
    Johns Hopkins University Baltimore, MD
  • Andrew S. Douglas
    Johns Hopkins University Baltimore, MD
  • Moriel Ness Aiver
    University of Maryland School of Medicine Baltimore
  • Rao Gullapalli
    University of Maryland School of Medicine Baltimore
  • William S. Levine
    University of Maryland College Park
  • Andrew Jon Lundberg
    Johns Hopkins University Baltimore, MD
  • Corresponding author: e-mail: mstone@umaryland.edu
Article Information
Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   October 01, 2001
Modeling Tongue Surface Contours From Cine-MRI Images
Journal of Speech, Language, and Hearing Research, October 2001, Vol. 44, 1026-1040. doi:10.1044/1092-4388(2001/081)
History: Received March 13, 2001 , Accepted June 8, 2001
 
Journal of Speech, Language, and Hearing Research, October 2001, Vol. 44, 1026-1040. doi:10.1044/1092-4388(2001/081)
History: Received March 13, 2001; Accepted June 8, 2001
Web of Science® Times Cited: 30

This study demonstrated that a simple mechanical model of global tongue movement in parallel sagittal planes could be used to quantify tongue motion during speech. The goal was to represent simply the differences in 2D tongue surface shapes and positions during speech movements and in subphonemic speech events such as coarticulation and left-to-right asymmetries. The study used tagged Magnetic Resonance Images to capture motion of the tongue during speech. Measurements were made in three sagittal planes (left, midline, right) during movement from consonants (/k/, /s/) to vowels (/i/, /a/, /u/). MR image-sequences were collected during the C-to-V movement. The image-sequence had seven time-phases (frames), each 56 ms in duration.

A global model was used to represent the surface motion. The motions were decomposed into translation, rotation, homogeneous stretch, and in-plane shear. The largest C-to-V shape deformation was from /k/ to/a/. It was composed primarily of vertical compression, horizontal expansion, and downward translation. Coarticulatory effects included a trade-off in which tongue shape accommodation was used to reduce the distance traveled between the C and V. Left-to-right motion asymmetries may have increased rate of motion by reducing the amount of mass to be moved.

Acknowledgments
This project was supported in part by grant DC025681, from the National Institute on Deafness and Other Communication Disorders, and Northrop Grumman Inc. Parts of this work were presented at the Fifth European Conference on Speech Communication and Technology (Eurospeech), Rhodes, Greece, September 1997.
Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access