Effets de l’expérience sur la perception de mélanges odorants chez l’Homme adulte et le lapereau nouveau-né

 Prix du meilleur poster• L’organisme est exposé à un environnement chimique complexe (mélanges d’odorants) duquel il doit extraire l’information.• Un signal véhiculé par un mélange peut être perçu de façon analytique AB = A+B et/ou synthétique AB = M (mélange)• Homme ->perception d’un mélange AB de façon partiellement synthétique (Le Berre et al.,2008)• Lapereaux -> perception du mélange AB de façon synthétique et analytique (Coureaud et al., 2008, 2009)Objectifs : Comment l’expérience influence-t-elle la perception de ce mélange AB et de ses composants A et B?Qu’en est-il pour un mélange perçu initialement de façon analytique (AC ou CD)

Pre-exposure to odour mixture modifies the perceptual quality of the components

Poster 34

Impact of pre-exposure on the perception of odorant mixtures in humans

International audienc

Experience shapes our odor perception but depends on the initial perceptual processing of the stimulus

The questions of whether configural and elemental perceptions are competitive or exclusive perceptual processes and whether they rely on independent or dependent mechanisms are poorly understood. To examine these questions, we modified perceptual experience through preexposure to mixed or single odors and measured the resulting variation in the levels of configural and elemental perception of target odor mixtures. We used target mixtures that were spontaneously processed in a configural or an elemental manner. The AB binary mixture spontaneously involved the configural perception of a pineapple odor, whereas component A smelled like strawberry and component B smelled like caramel. The CD mixture produced the elemental perceptions of banana (C) and smoky (D) odors. Perceptual experience was manipulated through repeated exposure to either a mixture (AB or CD) or the components (A and B or C and D). The odor typicality rating data recorded after exposure revealed different influences of experience on odor mixtures and single-component perception, depending both on the type of exposure (components or mixture) and the mixture's initial perceptual property (configural or elemental). Although preexposure to A and B decreased the pineapple typicality of the configural AB mixture, preexposure to AB did not modify its odor quality. In contrast, preexposure to the CD elemental mixture induced a quality transfer between the components. These results emphasize the relative plasticity of odor mixture perception, which is prone to experience-induced modulations but depends on the stimulus's initial perceptual properties, suggesting that configural and elemental forms of odor mixture perception rely on rather independent processes

Odour mixture processing: from birth to adulthood

absen