Modulations of `late' event-related brain potentials in humans by dynamic audiovisual speech stimuli

R Lebib , D Papo (1) , A Douiri , S De Bode , Mg Dowens , Pm Baudonniere

1 LPC - Laboratoire de psychologie cognitive

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. (C) 2004 Elsevier Ireland Ltd. All rights reserved.

Domaines: Psychologie

R Lebib, D Papo, A Douiri, S De Bode, Mg Dowens, et al.. Modulations of `late' event-related brain potentials in humans by dynamic audiovisual speech stimuli. Neuroscience Letters, 2004, 372 (1-2), pp.74-79. ⟨10.1016/j.neulet.2004.09.039⟩. ⟨hal-01441323⟩