Abstract
In this study physical measurements of talkers' lips during production of CVC monosyllables were correlated with perceptual confusions among the utterances during lipreading. Five talkers were videotaped producing a large set of CVC's with /f,v,w,r,p,b,t,d,h,g/ as consonants and /i,ɪ,a,ᴜ,u/ as vowels. Tracings were made from the tape and intelligibility of lipreading was determined by normal and hearing-impaired viewers. It was found that in contexts with minimal labial coarticulation the variance in vowel confusions was almost completely explained by static measurements of lip height and width at the point of maximal vowel constriction. In bilabial, rounded, and labio-dental contexts, however, it was found that (a) overall intelligibility of the vowel was reduced, (b) lip height and width predicted a high percentage of the perceptual confusions among the vowels, but vowel duration and lip trajectory improved the prediction in some cases, and (c) considerable variation existed among talkers and the intelligibility of individual talkers could be predicted by a small set of measurements of the lips during vowel production. [Work supported by Department of Clinical Investigation, WRAMC.]
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