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  High frequency local field potentials and multi unit activity reflect visual awareness in the macaque prefrontal cortex

Panagiotaropoulos, T., Kapoor, V., Keliris, G., Tolias, A., & Logothetis, N. (2009). High frequency local field potentials and multi unit activity reflect visual awareness in the macaque prefrontal cortex. Poster presented at 41st European Brain and Behaviour Society Meeting, Rhodos, Greece. doi:10.3389/conf.neuro.08.2009.09.251.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-C32F-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-0CA5-6
Genre: Poster

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 Creators:
Panagiotaropoulos, T1, 2, Author              
Kapoor, V1, 2, Author              
Keliris, GA1, 2, Author              
Tolias, A, Author              
Logothetis, NK1, 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: Binocular rivalry (BR) has been successfully combined with extracellular electrophysiological recordings in awake, behaving macaques to study the cortical mechanisms of subjective visual perception. Here we used binocular flash suppression (BFS), a highly controlled variant of BR, to explore the neuronal correlates of visual awareness in the inferior prefrontal convexity (icPFC) of the macaque brain while simultaneously recording multi unit activity (MUA) and local field potentials (LFP). We found that MUA was perceptually modulated in 67 of the visually selective recording sites. During BFS in 92 of MUA modulated sites we observed higher firing rates when the preferred stimulus was perceived. An explicit representation of the perceptually dominant stimulus was also provided by the power modulation of high frequency LFP’s only at the MUA modulated sites. Specifically, sensory selectivity of the LFP power increased as a function of frequency with the highest selectivity observed between 150 and 450Hz. The same pattern in LFP power selectivity was observed when the preferred stimulus was perceived during BFS. A correlation analysis between MUA and LFP power selectivity showed significant correlation in sensory selectivity for frequencies >60Hz that saturated at 150Hz and followed the same pattern during BFS. While spikes measure cortical output, LFP’s are thought to reflect input and intracortical processing in a given cortical area. According to this scheme our results suggest that icPFC sites providing perceptually modulated output are also the sites that receive and process a representation of the perceived stimulus during BFS. Inferior temporal cortex (IT) output is also known to reflect the perceived stimulus during ambiguous visual stimulation and could thus be the source of the modulated icPFC input reflected in the LFP’s. Our results suggest a highly organized network involving IT and icPFC that mediates visual awareness during subjective visual perception.

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 Dates: 2009-06
 Publication Status: Published online
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.3389/conf.neuro.08.2009.09.251
BibTex Citekey: PanagiotaropoulosKKTL2009
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Title: 41st European Brain and Behaviour Society Meeting
Place of Event: Rhodos, Greece
Start-/End Date: 2009-09-13 - 2009-09-18

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Title: Frontiers in Behavioral Neuroscience
  Abbreviation : Front Behav Neurosci
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Frontiers Research Foundation
Pages: - Volume / Issue: 2009 (Conference Abstract: 41st European Brain and Behaviour Society Meeting) Sequence Number: - Start / End Page: - Identifier: ISSN: 1662-5153
CoNE: https://pure.mpg.de/cone/journals/resource/1662-5153