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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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 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: Issued
 Pages: -
 Publishing info: -
 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
 Creator(s):
Affiliations:
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