Visual speech reduces uncertainty as to when auditory speech will occur, thereby enhancing detection of speech in noise. These detection benefits reflect a low-level perceptual mechanism of AV speech enhancement… Click to show full abstract
Visual speech reduces uncertainty as to when auditory speech will occur, thereby enhancing detection of speech in noise. These detection benefits reflect a low-level perceptual mechanism of AV speech enhancement that is independent of the linguistic nature of speech. Audiovisual speech detection benefits have primarily been assessed using two-interval forced-choice paradigms. Results from AV speech detection experiments using three different psychophysical approaches will be presented. These include a single-interval yes/no task, a go/no-go task, and a two-interval forced choice task. In all experiments, adults with normal hearing complete an auditory-only condition with a still image of the talker and an audiovisual condition with a synchronous and congruent visual speech signal. The audiovisual condition includes foil trials/intervals that force participants to use the auditory information to make the decision. Adults demonstrate significant audiovisual benefit to speech detection across all three task,...
               
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