PAROLES VUES : LA DIMENSION D'ARRONDISSEMENT DANS L'IDENTIFICATION VISUELLE DES VOYELLES DU FRANÇAIS

Quelles sont les dimensions qui structurent au mieux l'espace perceptif visuel des voyelles françaises ? Ces dimensions résistent-elles aux effets de contexte de la coarticulation ? Seul l'arrondissement apparaît à la fois comme une dimension organisante et robuste.What are the dimensions which structure at best the perceptual space of seen French vowels ? Do these dimensions resist to contextual effects in coarticulation ? Only rounding emerges as a true dimension both organizing and robust

Biochemical modifications involved in the maturation of the ovine fetal adrenal gland in late gestation : their modalities and regulation

International audienc

Audio-visual speech scene analysis: Characterization of the dynamics of unbinding and rebinding the McGurk effect

International audienceWhile audiovisual interactions in speech perception have long been considered as automatic, recentdata suggest that this is not the case. In a previous study, Nahorna et al. [(2012). J. Acoust. Soc.Am. 132, 1061–1077] showed that the McGurk effect is reduced by a previous incoherentaudiovisual context. This was interpreted as showing the existence of an audiovisual binding stagecontrolling the fusion process. Incoherence would produce unbinding and decrease the weight ofthe visual input in fusion. The present paper explores the audiovisual binding system to characterizeits dynamics. A first experiment assesses the dynamics of unbinding, and shows that it is rapid: Anincoherent context less than 0.5 s long (typically one syllable) suffices to produce a maximalreduction in the McGurk effect. A second experiment tests the rebinding process, by presenting ashort period of either coherent material or silence after the incoherent unbinding context.Coherence provides rebinding, with a recovery of the McGurk effect, while silence providesno rebinding and hence freezes the unbinding process. These experiments are interpreted in theframework of an audiovisual speech scene analysis process assessing the perceptual organization ofan audiovisual speech input before decision takes place at a higher processing stage