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  The Laminar and Temporal Structure of Stimulus Information in the Phase of Field Potentials of Auditory Cortex

Szymanski, F., Rabinowitz, N., Magri, C., Panzeri, S., & Schnupp, J. (2011). The Laminar and Temporal Structure of Stimulus Information in the Phase of Field Potentials of Auditory Cortex. The Journal of Neuroscience, 31(44), 15787-15801. doi:10.1523/JNEUROSCI.1416-11.2011.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-B910-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-AFD4-B
Genre: Journal Article

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Szymanski, FD, Author
Rabinowitz, NC, Author
Magri, C1, 2, Author              
Panzeri, S, Author              
Schnupp, JWH, 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              

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 Abstract: Recent studies have shown that the phase of low-frequency local field potentials (LFPs) in sensory cortices carries a significant amount of information about complex naturalistic stimuli, yet the laminar circuit mechanisms and the aspects of stimulus dynamics responsible for generating this phase information remain essentially unknown. Here we investigated these issues by means of an information theoretic analysis of LFPs and current source densities (CSDs) recorded with laminar multi-electrode arrays in the primary auditory area of anesthetized rats during complex acoustic stimulation (music and broadband 1/f stimuli). We found that most LFP phase information originated from discrete “CSD events” consisting of granular–superficial layer dipoles of short duration and large amplitude, which we hypothesize to be triggered by transient thalamocortical activation. These CSD events occurred at rates of 2–4 Hz during both stimulation with complex sounds and silence. During stimulation with complex sounds, these events reliably reset the LFP phases at specific times during the stimulation history. These facts suggest that the informativeness of LFP phase in rat auditory cortex is the result of transient, large-amplitude events, of the “evoked” or “driving” type, reflecting strong depolarization in thalamo-recipient layers of cortex. Finally, the CSD events were characterized by a small number of discrete types of infragranular activation. The extent to which infragranular regions were activated was stimulus dependent. These patterns of infragranular activations may reflect a categorical evaluation of stimulus episodes by the local circuit to determine whether to pass on stimulus information through the output layers.

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 Dates: 2011-11
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1523/JNEUROSCI.1416-11.2011
BibTex Citekey: SzymanskiRMPS2011
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Title: The Journal of Neuroscience
  Other : The Journal of Neuroscience: the Official Journal of the Society for Neuroscience
  Abbreviation : J. Neurosci.
Source Genre: Journal
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Publ. Info: Washington, DC : Society of Neuroscience
Pages: - Volume / Issue: 31 (44) Sequence Number: - Start / End Page: 15787 - 15801 Identifier: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187_1