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Dynamic Construction of Reduced Representations in the Brain for Perceptual Decision Behavior

Jiayu Zhan, Robin A. A. Ince, Nicola van Rijsbergen, Philippe G. Schyns
doi: https://doi.org/10.1101/284158
Jiayu Zhan
aInstitute of Neuroscience and Psychology, University of Glasgow, Scotland G12 8QB, United Kingdom
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Robin A. A. Ince
aInstitute of Neuroscience and Psychology, University of Glasgow, Scotland G12 8QB, United Kingdom
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Nicola van Rijsbergen
aInstitute of Neuroscience and Psychology, University of Glasgow, Scotland G12 8QB, United Kingdom
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Philippe G. Schyns
aInstitute of Neuroscience and Psychology, University of Glasgow, Scotland G12 8QB, United Kingdom
bSchool of Psychology, University of Glasgow, Scotland G12 8QB, United Kingdom
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  • For correspondence: philippe.schyns@glasgow.ac.uk
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Abstract

Current models propose that the brain uses a multi-layered architecture to reduce the high dimensional visual input to lower dimensional representations that support face, object and scene categorizations. However, understanding the brain mechanisms that support such information reduction for behavior remains challenging. We addressed the challenge using a novel information theoretic framework that quantifies the relationships between three key variables: single-trial information randomly sampled from an ambiguous scene, source-space MEG responses and perceptual decision behaviors. In each observer, behavioral analysis revealed the scene features that subtend their decisions. Independent source space analyses revealed the flow of these and other features in cortical activity. We show where (at the junction between occipital cortex and ventral regions), when (up until 170 ms post stimulus) and how (by separating task-relevant and irrelevant features) brain regions reduce the high-dimensional scene to construct task-relevant feature representations in the right fusiform gyrus that support decisions. Our results inform the occipito-temporal pathway mechanisms that reduce and select information to produce behavior.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 18, 2018.
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Dynamic Construction of Reduced Representations in the Brain for Perceptual Decision Behavior
Jiayu Zhan, Robin A. A. Ince, Nicola van Rijsbergen, Philippe G. Schyns
bioRxiv 284158; doi: https://doi.org/10.1101/284158
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Dynamic Construction of Reduced Representations in the Brain for Perceptual Decision Behavior
Jiayu Zhan, Robin A. A. Ince, Nicola van Rijsbergen, Philippe G. Schyns
bioRxiv 284158; doi: https://doi.org/10.1101/284158

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