Simultaneous Assessment of Pharyngeal Wall and Velar Displacement for Selected Speech Sounds Velar and pharyngeal wall displacements were studied simultaneously by using conventional lateral-view radiography and frontal-view tomography. Twenty-five normal adult male and female subjects were utilized. Major results pertaining to lateral pharyngeal wall displacements during speech include the following. 1) At more superior levels of the pharynx, greater mesial displacements occurred ... Research Article
Research Article  |   June 01, 1980
Simultaneous Assessment of Pharyngeal Wall and Velar Displacement for Selected Speech Sounds
 
Author Affiliations & Notes
  • Aquiles Iglesias
    Ohio State University, Columbus
  • David P. Kuehn
    The University of Iowa, Iowa City
  • Hughlett L. Morris
    The University of Iowa, Iowa City
Article Information
Research Articles
Research Article   |   June 01, 1980
Simultaneous Assessment of Pharyngeal Wall and Velar Displacement for Selected Speech Sounds
Journal of Speech, Language, and Hearing Research, June 1980, Vol. 23, 429-446. doi:10.1044/jshr.2302.429
History: Received December 22, 1978 , Accepted March 30, 1979
 
Journal of Speech, Language, and Hearing Research, June 1980, Vol. 23, 429-446. doi:10.1044/jshr.2302.429
History: Received December 22, 1978; Accepted March 30, 1979

Velar and pharyngeal wall displacements were studied simultaneously by using conventional lateral-view radiography and frontal-view tomography. Twenty-five normal adult male and female subjects were utilized. Major results pertaining to lateral pharyngeal wall displacements during speech include the following. 1) At more superior levels of the pharynx, greater mesial displacements occurred for nonnasal compared to nasal speech sounds and no significant differences were noted among the nonnasal speech sounds studied. 2) At an inferior level of the pharynx, mesial displacements were greater for low vowels compared to the other speech sounds studied but some lateral (outward) movements were observed during high vowel production for some subjects. 3) Greatest mesial displacements for all subjects and speech sounds studied occurred at the level of and just below the plane of the hard palate. Low correlations between velar and lateral pharyngeal wall displacements were obtained for most subjects. The results do not support the hypothesis that the levator veli palatini muscle is solely involved in both velar and lateral pharyngeal wall movements.

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