Wozniak V D, Jackson P L
J Speech Hear Res. 1979 Jun;22(2):354-65. doi: 10.1044/jshr.2202.354.
This study investigated vowel and diphthong lipreading performance from 0 degree and 90 degree angles of observation. Sixteen English vowels and diphthongs were placed in an /h-g/ context to form the stimulus items. Each item was presented by a speaker ten times in random order for a total of 160 items. The speaker was simultaneously videotaped from 0 degree and 90 degree angles under optimal lighting conditions. Ten normal hearing adults subjects phonetically recorded the vowel or diphtong they perceived as each item was visually presented. The diphthong stimuli were significantly easier to identify than the vowel stimuli at both angles of observation. In addition, no significant differences were found between the 0 degree and 90 degree angles in terms of percentage of correct identifications of all phonemes examined. Orderly, predictable confusions also were observed. Those confusions occurring in visual diphthong recognition tended to shift toward the stressed vowel element of the diphthong or to a vowel produced in a manner similar to the stressed element.
本研究调查了在0度和90度观察角度下元音和双元音的唇读表现。16个英语元音和双元音被置于/h - g/语境中以形成刺激项目。每个项目由一名说话者以随机顺序呈现十次，共计160个项目。在最佳光照条件下，从0度和90度角度同时对说话者进行录像。十名听力正常的成年受试者在每个项目视觉呈现时，语音记录他们所感知到的元音或双元音。在两个观察角度下，双元音刺激都比元音刺激明显更容易识别。此外，在所检查的所有音素的正确识别百分比方面，0度和90度角度之间未发现显著差异。还观察到了有序、可预测的混淆情况。视觉双元音识别中出现的那些混淆往往会向双元音的重读音素元素转移，或者转移到以与重读音素元素相似的方式发出的元音上。
