Social interactions often involve a cluttered multisensory scene consisting of multiple talking faces. We investigated whether audiovisual temporal synchrony can facilitate perceptual segregation of talking faces. Participants either saw four identical or four different talking faces producing temporally jittered versions of the same visible speech utterance and heard the audible version of the same speech utterance. The audible utterance was either synchronized with the visible utterance produced by one of the talking faces or not synchronized with any of them. Eye tracking indicated that participants exhibited a marked preference for the synchronized talking face, that they gazed more at the mouth than the eyes overall, that they gazed more at the eyes of an audiovisually synchronized than a desynchronized talking face, and that they gazed more at the mouth when all talking faces were audiovisually desynchronized. These findings demonstrate that audiovisual temporal synchrony plays a major role in perceptual segregation of multisensory clutter and that adults rely on differential scanning strategies of a talker's eyes and mouth to discover sources of multisensory coherence.

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