Ircam-Centre Pompidou

Recherche

  • Recherche simple
  • Recherche avancée

    Panier électronique

    Votre panier ne contient aucune notice

    Connexion à la base

  • Identification
    (Identifiez-vous pour accéder aux fonctions de mise à jour. Utilisez votre login-password de courrier électronique)

    Entrepôt OAI-PMH

  • Soumettre une requête

    Consulter la notice détailléeConsulter la notice détaillée
    Version complète en ligneVersion complète en ligne
    Version complète en ligne accessible uniquement depuis l'IrcamVersion complète en ligne accessible uniquement depuis l'Ircam
    Ajouter la notice au panierAjouter la notice au panier
    Retirer la notice du panierRetirer la notice du panier

  • English version
    (full translation not yet available)
  • Liste complète des articles

  • Consultation des notices


    Vue détaillée Vue Refer Vue Labintel Vue BibTeX  

    Catégorie de document Contribution à un colloque ou à un congrès
    Titre Neuronal population correlate of asymmetric auditory perception in mice
    Auteur principal Brice Bathellier
    Co-auteurs Thomas Deneux, Louise François, Suncana Sikiric, Emmanuel Ponsot
    Colloque / congrès Fifth Annual Meeting of the GDR Multielectrodes. Gif sur Yvette : Octobre 2014
    Comité de lecture Indéterminé
    Année 2014
    Statut éditorial Publié
    Résumé

    Natural sounds display strong intensity fluctuations over time. However, we currently understand better auditory processing in the frequency domain than in the temporal domain. Recently, auditory psychophysics showed that humans perceive a sound whose intensity increases as louder than a sound whose intensity decreases over time, although the overall intensity of the sounds are the same. The underlying neuronal mechanisms of this striking perceptual asymmetry are still elusive. To test if the direction of intensity variation is asymmetrically processed by the auditory system, we have recorded the activity of large populations of neurons in the auditory cortex of awake mice while playing sounds of ramping-up and ramping-down intensities with various durations. We observed that long ramps (> 250ms) produce complex cortical population dynamics with different sets of neurons firing at the beginning compared to the end of the ramps. This indicates that the coding of intensity variations coding is strongly distributed in the auditory cortex. More interestingly, we observed that population firing rate is overall larger for increasing ramps than for decreasing ramps, suggesting that, also for mice, sounds ramping up could be perceptually more salient than sounds ramping down. To test this hypothesis, we performed behavioral experiments in which the saliency of a sound is measured through associative learning speed. We observed that increasing ramps are more rapidly associated to a correct behavior than decreasing ramps, showing that increasing sound intensities are more salient than decreasing sound intensities for mice. Altogether, these novel observations indicate that strongly non-linear processes in the auditory system shape both the perception and the cortical representation of time-varying sounds, to eventually reinforce rising and thus potentially approaching sound sources.

    Equipes Autre (hors R&D), Perception et design sonores
    Cote Bathellier14a

    © Ircam - Centre Pompidou 2005.