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Evidence of a visual-to-auditory cross-modal sensory gating phenomenon as reflected by the human P50 event-related brain potential modulation

Abstract : We investigated the existence of a cross-modal sensory gating reflected by the modulation of an early electrophysiological index, the P50 component. We analyzed event-related brain potentials elicited by audiovisual speech stimuli manipulated along two dimensions: congruency and discriminability. The results showed that the P50 was attenuated when visual and auditory speech information were redundant (i.e. congruent), in comparison with this same event-related potential component elicited with discrepant audiovisual dubbing. When hard to discriminate, however, bimodal incongruent speech stimuli elicited a similar pattern of P50 attenuation. We concluded to the existence of a visual-to-auditory cross-modal sensory gating phenomenon. These results corroborate previous findings revealing a very early audiovisual interaction during speech perception. Finally, we postulated that the sensory gating system included a cross-modal dimension. (C) 2003 Elsevier Science Ireland Ltd. All rights reserved.
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https://hal.archives-ouvertes.fr/hal-01441343
Contributor : Jean-Baptiste Melmi Connect in order to contact the contributor
Submitted on : Thursday, January 19, 2017 - 5:10:46 PM
Last modification on : Tuesday, October 19, 2021 - 10:58:52 PM

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R Lebib, D Papo, S Bode, Pm Baudonniere. Evidence of a visual-to-auditory cross-modal sensory gating phenomenon as reflected by the human P50 event-related brain potential modulation. Neuroscience Letters, Elsevier, 2003, 341 (3), pp.185-188. ⟨10.1016/S0304-3940(03)00131-9⟩. ⟨hal-01441343⟩

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