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  • Title: Visual speech improves the intelligibility of time-expanded auditory speech.
    Author: Tanaka A, Sakamoto S, Tsumura K, Suzuki Y.
    Journal: Neuroreport; 2009 Mar 25; 20(5):473-7. PubMed ID: 19240661.
    Abstract:
    This study investigated the effects of intermodal timing differences and speed differences on word intelligibility of auditory-visual speech. Words were presented under visual-only, auditory-only, and auditory-visual conditions. Two types of auditory-visual conditions were used: asynchronous and expansion conditions. In the asynchronous conditions, the audio lag was 0-400 ms. In the expansion conditions, the auditory signal was time expanded (0-400 ms), whereas the visual signal was kept at the original speed. Results showed that word intelligibility was higher in the auditory-visual conditions than in the auditory-only condition. The results of auditory-visual benefit revealed that the benefit at the end of words declined as the amount of time expansion increased, although it did not decline in the asynchronous conditions.
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