Subtelny J D, Whitehead R L, Samar V J
Department of Communication Research, National Technical Institute for the Deaf at Rochester Institute of Technology, NY 14623-0887.
J Speech Hear Res. 1992 Jun;35(3):574-9. doi: 10.1044/jshr.3503.574.
In a previous radiographic study of 4 deaf women, some aberrant features in vocal tract configuration were identified for vowels produced with excessive pharyngeal resonance. These features included neutralization of tongue position, elevation of the hyoid, and a retraction of the tongue, associated with a deflection of the epiglottis in the lower pharynx. The vowels, produced simultaneously with X-ray exposure, were analyzed spectrographically to study acoustic correlates of the vocal tract deformation. Comparisons of the formants for vowels /i/ /u/ and /a/ produced by the deaf women with mean formant values for these vowels produced by normal-hearing women revealed no consistent pattern of second-formant deviation. Formant structure evaluated on isovowel lines disclosed consistent neutralization of vowels, with F2 values clustering in the 1500-2100 Hz frequency range, which is attributed to the observed restricted horizontal movements of the tongue within the oral and pharyngeal cavities. If such restrictions affect the production of all vowels, a lower F2 might be assumed for the front vowels, which normally have a high F2; a higher F2 frequency would be anticipated for back vowels, which normally have a low F2. The limited sample studied supports this assumption.
在之前一项针对4名失聪女性的影像学研究中，发现了一些声道构型的异常特征，这些特征与过度咽腔共鸣发出的元音有关。这些特征包括舌位中和、舌骨抬高、舌头后缩，同时下咽会厌发生偏斜。在X射线照射时同步发出的元音，通过频谱分析来研究声道变形的声学相关性。将失聪女性发出的元音/i/ /u/和/a/的共振峰与听力正常女性发出的这些元音的平均共振峰数值进行比较，结果显示第二共振峰没有一致的偏离模式。在等元音线上评估的共振峰结构显示元音出现了一致的中和现象，F2值聚集在1500 - 2100赫兹频率范围内，这归因于观察到舌头在口腔和咽腔内水平移动受限。如果这种限制影响所有元音的发音，那么对于通常具有较高F2值的前元音，可能会假设其F2值较低；对于通常具有较低F2值的后元音，则预计其F2频率会较高。所研究的有限样本支持这一假设。
