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  Retinotopic specific modulations in early visual cortex by feedback during bistable Gestalt perception

Grassi, P., Zaretskaya, N., & Bartels, A. (2017). Retinotopic specific modulations in early visual cortex by feedback during bistable Gestalt perception. Poster presented at Cortical Feedback Springschool (COFEES 2017), Jena, Germany.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-C4FB-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-C4FC-7
Genre: Poster

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Grassi, PR1, 2, Author              
Zaretskaya, N1, 3, Author              
Bartels, A1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
3Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              

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 Abstract: A growing body of literature suggests that feedback modulation of early visual processing is ubiquitous and central to cortical computation. In particular stimuli with high-level content have been shown to suppress early visual regions, typically interpreted in the framework of predictive coding. However, physical stimulus differences can preclude clear interpretations in terms of feedback. Here we examined activity modulation in V1 and V2 during distinct perceptual states associated to the same physical input. This ensures in a unique way that observed signal modulations cannot be accounted for by changes in physical stimulus properties, and can therefore only be accounted for by percept-related feedback interactions from higher level regions. We used a dynamic stimulus consisting of moving dots that could either be perceived as corners of a large moving square (global Gestalt) or as distributed sets of locally moving dots. We found that perceptual binding of local moving elements into an illusory Gestalt led to spatially segregated differential modulations, in both, V1 and V2: representations of illusory lines and foreground were enhanced, while inducers and background suppressed. The results extend prior findings to the illusory-perceptual state of physically un- ‐changed stimuli, and for the first time show background suppression in the human brain. Based on prior work (Zaretskaya et al., 2013), we hypothesize that parietal cortex is responsible for the modulations through recurrent connections in a predictive coding account of visual processing.

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 Dates: 2017-03
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: GrassiZB2017
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Title: Cortical Feedback Springschool (COFEES 2017)
Place of Event: Jena, Germany
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Title: Cortical Feedback Springschool (COFEES 2017)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 25 - 25 Identifier: -