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Related Experiment Videos

Intermodal timing relations and audio-visual speech recognition by normal-hearing adults.

M McGrath, Q Summerfield

    The Journal of the Acoustical Society of America
    |February 1, 1985
    PubMed
    Summary

    Audio delay significantly impacts audio-visual speech perception, with delays over 160 ms rendering speech unintelligible. Even small delays affect skilled lipreaders, suggesting limited use of fine-grained timing cues in lipreading.

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    Area of Science:

    • Audiology
    • Speech Science
    • Human Perception

    Background:

    • Audio-visual speech perception relies on synchronized auditory and visual cues.
    • Understanding the impact of audio delay on speech intelligibility is crucial for developing assistive technologies.

    Purpose of the Study:

    • To investigate the effect of audio delay on audio-visual sentence identification in normal-hearing observers.
    • To explore the role of intermodal timing cues in audio-visual speech perception.

    Main Methods:

    • Experiment 1: Measured sentence identification scores with varying audio delays (0-160 ms) using modified soundtracks.
    • Experiment 2: Assessed intermodal timing sensitivity by comparing auditory tone onset with visual lip movement using Lissajous figures.

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    Main Results:

    • Sentence identification scores significantly decreased with audio delays exceeding 80 ms, becoming indistinguishable from no auditory information at 160 ms.
    • Better lipreaders showed a trend of reduced performance with increasing delay (0-80 ms), but overall sensitivity to fine-grained intermodal timing cues was limited.
    • No significant correlation was found between lipreading ability and the ability to detect subtle audio-visual timing differences.

    Conclusions:

    • Most individuals lack the sensitivity to utilize intermodal timing cues for audio-visual speech perception beyond a certain delay threshold.
    • Signal processing delays up to approximately 40 ms in lipreading aids are unlikely to significantly impair audio-visual speech understanding.