Neural mechanisms of vibrotactile categorization.

Détails

ID Serval
serval:BIB_61C3262A3381
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Neural mechanisms of vibrotactile categorization.
Périodique
Human brain mapping
Auteur(s)
Malone P.S., Eberhardt S.P., Wimmer K., Sprouse C., Klein R., Glomb K., Scholl C.A., Bokeria L., Cho P., Deco G., Jiang X., Bernstein L.E., Riesenhuber M.
ISSN
1097-0193 (Electronic)
ISSN-L
1065-9471
Statut éditorial
Publié
Date de publication
07/2019
Peer-reviewed
Oui
Volume
40
Numéro
10
Pages
3078-3090
Langue
anglais
Résumé
The grouping of sensory stimuli into categories is fundamental to cognition. Previous research in the visual and auditory systems supports a two-stage processing hierarchy that underlies perceptual categorization: (a) a "bottom-up" perceptual stage in sensory cortices where neurons show selectivity for stimulus features and (b) a "top-down" second stage in higher level cortical areas that categorizes the stimulus-selective input from the first stage. In order to test the hypothesis that the two-stage model applies to the somatosensory system, 14 human participants were trained to categorize vibrotactile stimuli presented to their right forearm. Then, during an fMRI scan, participants actively categorized the stimuli. Representational similarity analysis revealed stimulus selectivity in areas including the left precentral and postcentral gyri, the supramarginal gyrus, and the posterior middle temporal gyrus. Crucially, we identified a single category-selective region in the left ventral precentral gyrus. Furthermore, an estimation of directed functional connectivity delivered evidence for robust top-down connectivity from the second to first stage. These results support the validity of the two-stage model of perceptual categorization for the somatosensory system, suggesting common computational principles and a unified theory of perceptual categorization across the visual, auditory, and somatosensory systems.
Mots-clé
cognition, frontal lobe, humans, magnetic resonance imaging, somatosensory cortex
Pubmed
Web of science
Création de la notice
15/04/2019 10:44
Dernière modification de la notice
21/08/2019 6:14
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