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  The role of parietal visual cortex in perceptual transitions during bistable perception

Bahmani, H., Logothetis, N., & Keliris, G. (2012). The role of parietal visual cortex in perceptual transitions during bistable perception. Poster presented at 12th Annual Meeting of the Vision Sciences Society (VSS 2012), Naples, FL, USA.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-B69A-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BDD1-B
Genre: Poster

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 Creators:
Bahmani, H1, 2, Author              
Logothetis, NK1, 2, Author              
Keliris, GA1, 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, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Several imaging studies in humans have shown the involvement of a frontoparietal network of cortical areas in perceptual transitions during bistable perception. To investigate further the possible role of parietal visual areas in perceptual alternations, we recorded extracellular neural activity in the lateral intraparietal area (LIP) of the rhesus macaque. The subject was initially presented with congruent patterns to the two eyes. Then the stimulus was switched for either one or both eyes (binocular flash suppression versus physical alternation), both resulting in perception of the newly presented stimulus. The recorded cells typically showed an initial burst of activity at stimulus onsets as well as stimulus switches. In contrast to previous reports by a number of fMRI studies, we found strong transient activity during physical alternations at the single cell level. This signal was also present during binocular flash suppression but to a lesser extent. Importantly, the amplitude of the signal dropped substantially in control conditions where physical changes were introduced in the stimuli but did not induce concomitant changes in perception. The transient response of the recorded neurons was followed by a tonic response which exhibited independent dynamics. Interestingly, this sustained activity was significantly lower during incongruent versus congruent stimulation. We conjecture that areas at the high end of the dorsal pathway might be involved in multistable perception in a different way in comparison with feature and object selective areas of the ventral pathway. The transient signal recorded in LIP neurons during perceptual transitions could potentially trigger reorganization of activity in constellations of feature selective neurons in the ventral pathway. In addition, the suppression of the sustained activity in LIP during incongruent stimulation may reflect inhibitory processes involved in the resolution of conflict between the two stimuli or indicate a failure to bind the sensory input into a coherent percept.

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 Dates: 2012-08
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: BahmaniLK2012
DOI: 10.1167/12.9.683
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Title: 12th Annual Meeting of the Vision Sciences Society (VSS 2012)
Place of Event: Naples, FL, USA
Start-/End Date: 2012-05-11 - 2012-05-16

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Title: Journal of Vision
Source Genre: Journal
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Publ. Info: Charlottesville, VA : Scholar One, Inc.
Pages: - Volume / Issue: 12 (9) Sequence Number: - Start / End Page: 683 Identifier: ISSN: 1534-7362
CoNE: https://pure.mpg.de/cone/journals/resource/111061245811050