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Coarticulation effects in lipreading

A P Benguerel, M K Pichora-Fuller

    Journal of Speech and Hearing Research
    |December 1, 1982
    PubMed
    Summary

    Lipreading performance for certain speech sounds (/p/, /f/, /w/, /θ/, /u/) was excellent, while others (/t/, /k/, /tʃ/, /s/, /i/, /æ/) varied with phonetic context. Coarticulation impacts lipreading difficulty.

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    Area of Science:

    • Audiology
    • Speech Science
    • Linguistics

    Background:

    • Lipreading (speechreading) is crucial for individuals with hearing impairments.
    • Existing literature suggests variability in visual perception of phonemes.
    • Coarticulation, the influence of adjacent sounds on articulation, may affect lipreading accuracy.

    Purpose of the Study:

    • To analyze the influence of phonetic context on lipreading scores.
    • To explain variability in visual phoneme perception.
    • To assess the transmission of phonetic features during lipreading.

    Main Methods:

    • Normal-hearing and hearing-impaired subjects with good lipreading skills participated.
    • Subjects lipread videotaped V1CV2 utterances (V=/i/, /æ/, /u/; C=/p/, /t/, /k/, /tʃ/, /f/, /θ/, /s/, /ʃ/, /w/).
    • Analysis of lipreading scores and phonetic feature transmission.

    Main Results:

    • High lipreading performance for /p/, /f/, /w/, /θ/, and /u/.
    • Context-dependent lipreading performance for /t/, /k/, /tʃ/, /s/, /i/, and /æ/.
    • Labial, rounded, and alveolar/palatal features transmitted more information than continuant features.

    Conclusions:

    • Phonetic context significantly influences lipreading accuracy for specific phonemes.
    • Coarticulation-induced articulatory variability increases lipreading difficulty.
    • Certain phonetic features are more visually salient for lipreaders.

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