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  The neural mechanisms of reliability weighted integration of shape information from vision and touch

Helbig, H. B., Ernst, M. O., Ricciardi, E., Pietrini, P., Thielscher, A., Mayer, K., et al. (2012). The neural mechanisms of reliability weighted integration of shape information from vision and touch. NeuroImage, 60(2), 1063-1072. doi:10.1016/j.neuroimage.2011.09.072.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-13B1-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-C978-4
Genre: Journal Article

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 Creators:
Helbig, Hannah B.1, Author
Ernst, Marc O.1, Author
Ricciardi, Emiliano2, Author
Pietrini, Pietro2, Author
Thielscher, Alex1, Author
Mayer, Katja1, Author              
Schultz, Johannes1, Author
Noppeney, Uta1, Author
Affiliations:
1Max Planck Institute for Biological Cybernetics, Tübingen, Germany, ou_persistent22              
2University of Pisa, Italy, ou_persistent22              

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Free keywords: Vision; Touch; Multisensory integration; Maximum likelihood estimation; Shape; fMRI; Postcentral sulcus
 Abstract: Behaviourally, humans have been shown to integrate multisensory information in a statistically-optimal fashion by averaging the individual unisensory estimates according to their relative reliabilities. This form of integration is optimal in that it yields the most reliable (i.e. least variable) multisensory percept. The present study investigates the neural mechanisms underlying integration of visual and tactile shape information at the macroscopic scale of the regional BOLD response. Observers discriminated the shapes of ellipses that were presented bimodally (visual–tactile) or visually alone. A 2 × 5 factorial design manipulated (i) the presence vs. absence of tactile shape information and (ii) the reliability of the visual shape information (five levels). We then investigated whether regional activations underlying tactile shape discrimination depended on the reliability of visual shape. Indeed, in primary somatosensory cortices (bilateral BA2) and the superior parietal lobe the responses to tactile shape input were increased when the reliability of visual shape information was reduced. Conversely, tactile inputs suppressed visual activations in the right posterior fusiform gyrus, when the visual signal was blurred and unreliable. Somatosensory and visual cortices may sustain integration of visual and tactile shape information either via direct connections from visual areas or top-down effects from higher order parietal areas.

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Language(s): eng - English
 Dates: 2011-09-082011-04-062011-09-242011-10-062012-04-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.neuroimage.2011.09.072
PMID: 22001262
PMC: Epub 2011
 Degree: -

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Title: NeuroImage
Source Genre: Journal
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Affiliations:
Publ. Info: Orlando, FL : Academic Press
Pages: - Volume / Issue: 60 (2) Sequence Number: - Start / End Page: 1063 - 1072 Identifier: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166