Neural mechanisms of vibrotactile categorization.

Details

Serval ID
serval:BIB_61C3262A3381
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Neural mechanisms of vibrotactile categorization.
Journal
Human brain mapping
Author(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
Publication state
Published
Issued date
07/2019
Peer-reviewed
Oui
Volume
40
Number
10
Pages
3078-3090
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
Publication Status: ppublish
Abstract
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.
Keywords
Adolescent, Adult, Brain/physiology, Female, Humans, Magnetic Resonance Imaging/methods, Male, Models, Neurological, Neural Pathways/physiology, Touch Perception/physiology, Vibration, Young Adult, cognition, frontal lobe, humans, magnetic resonance imaging, somatosensory cortex
Pubmed
Web of science
Open Access
Yes
Create date
15/04/2019 9:44
Last modification date
05/04/2020 5:20
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