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  • Title: Modulations of 'late' event-related brain potentials in humans by dynamic audiovisual speech stimuli.
    Author: Lebib R, Papo D, Douiri A, de Bode S, Gillon Dowens M, Baudonnière PM.
    Journal: Neurosci Lett; 2004 Nov 30; 372(1-2):74-9. PubMed ID: 15531091.
    Abstract:
    Lipreading reliably improve speech perception during face-to-face conversation. Within the range of good dubbing, however, adults tolerate some audiovisual (AV) discrepancies and lipreading, then, can give rise to confusion. We used event-related brain potentials (ERPs) to study the perceptual strategies governing the intermodal processing of dynamic and bimodal speech stimuli, either congruently dubbed or not. Electrophysiological analyses revealed that non-coherent audiovisual dubbings modulated in amplitude an endogenous ERP component, the N300, we compared to a 'N400-like effect' reflecting the difficulty to integrate these conflicting pieces of information. This result adds further support for the existence of a cerebral system underlying 'integrative processes' lato sensu. Further studies should take advantage of this 'N400-like effect' with AV speech stimuli to open new perspectives in the domain of psycholinguistics.
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