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  Audio-visual interactions within the cortical hierarchy

Noppeney, U. (2007). Audio-visual interactions within the cortical hierarchy. Neural Plasticity, 2007: 23250, 29.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-D8F6-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-F3D5-A
Genre: Meeting Abstract

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 Creators:
Noppeney, U1, 2, Author              
Affiliations:
1Research Group Cognitive Neuroimaging, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497804              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: To interact effectively with our environment, the human brain integrates information from multiple senses into a coherent percept. Neurophysiological and functional imaging studies have revealed multi-sensory interactions in a widespread neural system encompassing subcortical structures, putative ’unisensory’ and higher order association cortices. Combining fMRI and psychophysics, we investigated where and how different types of sensory features are combined within the cortical hierarchy. We presented subjects with object pictures and sounds while factorially manipulating the relative informativeness of the auditory and visual modalities. While low level spatio-temporal interactions were found within Heschl’s gyrus, higher order object features were integrated within the superior temporal sulci (STS) bilaterally. Consistent with the law of inverse effectiveness, the multisensory interactions in STS were primarily suppressive for intact, but (super)additive for degraded stimuli. These distinct modes paralleled behavioral indices of multi-sensory enhancement showing the greatest multisensory benefit for degraded stimuli. In conclusion, the human brain integrates information that is abstracted from its sensory inputs atmultiple levels of the cortical hierarchy. The operational mode of audio-visual integration is dictated by the informativeness of the auditory and visual modalities.

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 Dates: 2007-09
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1155/2007/23250
 Degree: -

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Title: 39th Annual General Meeting of the European Brain and Behaviour Society (EBBS 2007)
Place of Event: Trieste, Italy
Start-/End Date: 2007-09-15 - 2007-09-19
Invited: Yes

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Title: Neural Plasticity
Source Genre: Journal
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Publ. Info: New York : Hindawi
Pages: - Volume / Issue: 2007 Sequence Number: 23250 Start / End Page: 29 Identifier: Other: 1687-5443
CoNE: https://pure.mpg.de/cone/journals/resource/1687-5443