Patterns of variance in /s/ during normal and glossectomy speech
نویسندگان
چکیده
The production of speech includes considerable variability in speech gestures despite our perception of very repeatable sounds. Variability is seen in vocal tract shapes and tongue contours when different speakers produce the same sound. This study asks whether internal tongue motion patterns for a specific sound are similar across subjects, or whether they indicate multiple gestures. There are two variants of the sound /s/, which may produce two gestures, or may represent a multitude of gestures. The first goal of this paper is to quantify internal tongue differences between these allophones in normal speakers. The second goal is to test how these differences are affected by subjects expected to have different speech gestures: normal controls and subjects who have had tongue cancer surgery. The study uses tagged MRI to capture midsagittal tongue motion patterns and Principal Components Analyses to identify patterns of variability that define subject groups and /s/-types. Results showed no motion differences between apical and laminal controls in either the tongue tip or whole-tongue. These results did not support unique tongue behaviours for apical and laminal /s/. The apical patients, however, differed from all other speakers and were quite uniform as a group. They had no elevation and considerable downward/backward motion of the tongue tip. This was consistent with difficulty maintaining the tip-blade region at the proper distance from the palate.
منابع مشابه
Tongue motion patterns in post-glossectomy and typical speakers: a principal components analysis.
PURPOSE In this study, the authors examined changes in tongue motion caused by glossectomy surgery. A speech task that involved subtle changes in tongue-tip positioning (the motion from /i/ to /s/) was measured. The hypothesis was that patients would have limited motion on the tumor (resected) side and would compensate with greater motion on the nontumor side in order to elevate the tongue tip ...
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ورودعنوان ژورنال:
- Computer methods in biomechanics and biomedical engineering. Imaging & visualization
دوره 2 4 شماره
صفحات -
تاریخ انتشار 2014