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  How prior expectations shape multisensory perception

Gau, R., & Noppeney, U. (2016). How prior expectations shape multisensory perception. NeuroImage, 124(Part A), 876-886. doi:10.1016/j.neuroimage.2015.09.045.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-7A44-B Version Permalink: http://hdl.handle.net/21.11116/0000-0000-7A45-A
Genre: Journal Article

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Gau, R1, 2, Author              
Noppeney, U1, 2, 3, Author              
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1Research Group Cognitive Neuroimaging, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497804              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
3Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

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 Abstract: The brain generates a representation of our environment by integrating signals from a common source, but segregating signals from different sources. This fMRI study investigated how the brain arbitrates between perceptual integration and segregation based on top-down congruency expectations and bottom-up stimulus-bound congruency cues. Participants were presented audiovisual movies of phonologically congruent, incongruent or McGurk-MacDonald syllables that can be integrated into an illusory percept (e.g. "ti" percept for visual «ki» with auditory /pi/). They reported the syllable they perceived. Critically, we manipulated participants' top-down congruency expectations by presenting McGurk-MacDonald stimuli embedded in blocks of congruent or incongruent syllables. Behaviourally, participants were more likely to fuse audiovisual signals into an illusory McGurk-MacDonald percept in congruent than incongruent contexts. At the neural level, the left inferior frontal sulcus (lIFS) showed increased activations for bottom-up incongruent relative to congruent inputs. Moreover, lIFS activations were increased for physically identical McGurk-MacDonald signals, when participants segregated signals and reported their auditory percept. Critically, this activation increase for perceptual segregation was amplified when participants expected audiovisually incongruent signals based on prior sensory experience. Collectively, our results demonstrate that the lIFS combines top-down prior (in)congruency expectations with bottom-up (in)congruency cues to arbitrate between multisensory integration and segregation.

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 Dates: 2016-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.neuroimage.2015.09.045
BibTex Citekey: GauN2015
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Title: NeuroImage
Source Genre: Journal
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Pages: - Volume / Issue: 124 (Part A) Sequence Number: - Start / End Page: 876 - 886 Identifier: -