Auditory hemispheric asymmetry for actions and objects

Author:

Robert Paul1ORCID,Zatorre Robert23,Gupta Akanksha1,Sein Julien4,Anton Jean-Luc4,Belin Pascal4,Thoret Etienne4567,Morillon Benjamin1ORCID

Affiliation:

1. Aix Marseille University Institut de Neurosciences des Systèmes (INS), Inserm/UMR1106, , 27 Bd Jean Moulin, Marseille 13005, France

2. Montreal Neurological Institute (MNI), Cognitive Neuroscience Unit, McGill University , 3801 Rue University, Montréal, QC H3A 2B4, Canada

3. McGill University Centre for Research in Brain, Language, and Music (CRBLM), , Faculty of Medicine 3640 de la Montagne, Montreal QC H3G 2A8, Canada

4. Aix Marseille University Institut de Neurosciences de la Timone (INT), CNRS/UMR7289, , 27 Bd Jean Moulin, Marseille 13005, France

5. Aix Marseille University PRISM Laboratory, CNRS/UMR7061, , 31 Chemin Joseph Aiguier, Marseille, 13402 Cedex 20, France

6. Aix Marseille University Laboratoire d’Informatique et Systèmes (LIS), CNRS/UMR7020, , 52 Av Escadrille Normandie Niemen, Marseille, 13397 Cedex 20, France

7. Aix Marseille University Institute of Language, Communication, and the Brain (ILCB), , 5 avenue Pasteur, Aix-en-Provence, 13604 Cedex 1, France

Abstract

Abstract What is the function of auditory hemispheric asymmetry? We propose that the identification of sound sources relies on the asymmetric processing of two complementary and perceptually relevant acoustic invariants: actions and objects. In a large dataset of environmental sounds, we observed that temporal and spectral modulations display only weak covariation. We then synthesized auditory stimuli by simulating various actions (frictions) occurring on different objects (solid surfaces). Behaviorally, discrimination of actions relies on temporal modulations, while discrimination of objects relies on spectral modulations. Functional magnetic resonance imaging data showed that actions and objects are decoded in the left and right hemispheres, respectively, in bilateral superior temporal and left inferior frontal regions. This asymmetry reflects a generic differential processing—through differential neural sensitivity to temporal and spectral modulations present in environmental sounds—that supports the efficient categorization of actions and objects. These results support an ecologically valid framework of the functional role of auditory brain asymmetry.

Funder

platform member of France Life Imaging network

Publisher

Oxford University Press (OUP)

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