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• W137603947 abstract "Event Abstract Back to Event Precise spike synchronization in the gamma band increases information gain in awake monkey V1 Cortical information processing relies on efficient communication among those neurons coding for the veridical information about sensory inputs. This entails two fundamental functions subserved by neuronal circuitry, including (i) the robust encoding of sensory information, and (ii) a mechanistically efficient transfer and communication of encoded information between neuronal groups. Approaches so far have considered both aspects as largely independent, but here, we propose that encoding and transfer are tightly linked and subserved by rhythmic neuronal synchronization in the gamma frequency band. Previous work has shown that neuronal communication is rendered particularly efficient during periods of precise gamma-band synchronization [1]. It is unclear, however, whether synchronization of neuronal spike times to the gamma band rhythm of a local neuronal group is also modulating the information gain of the spiking response and thereby contributes also to a robust and reliable encoding of sensory information [2, 3]. We therefore hypothesized that the local gamma band rhythm provides a temporal reference frame to render those spikes particularly informative about sensory inputs, which are also the most efficient spikes in affecting postsynaptic target neurons. To test this hypothesis, we simultaneously recorded the spiking activity of single isolated units and the local field potentials (LFPs) in area V1 of three awake macaque monkeys performing a fixation task. During fixation, neuronal sites were stimulated with moving gratings of eight different orientations. For each orientation, we calculated the neuronal spiking responses as a function of the LFP gamma-band phase based on standard Hanning windowed Fourier transforms of the LFP. This allowed us to quantify neuronal information about stimulus orientation for spikes occurring in different time periods within the gamma cycle. Similar to previous studies, we find that spike rates and spike-LFP synchronization are both tuned to orientation. However, stimulus information varied across the gamma cycle with maximal information gain for spikes at the preferred gamma phase of a neuron. Surprisingly, the gamma cycle allowed to obtain maximal information about stimulus orientation with less then 20% of all spike occurrences of a particular neuron: More information was gained from the most gamma-locked spikes than from all spikes taken together, i.e. from the spike count. These findings strongly suggest that rhythmic gamma band activity provides a critical temporal reference which renders some spikes to be informative about sensory inputs, while other spikes are rendered redundant and non-informative. Taken together, the study demonstrates a synergy between neuronal encoding mechanisms and neuronal communication mechanisms, revealing that those spikes that are mechanistically most effective in affecting postsynaptic target neurons, are also functionally the most informative. Acknowledgments This research was supported by The Netherlands Organization for Scientific Research, grant 452-03-344 (P.F.) and grant 016-071-079 (T.W.) References 1. Womelsdorf T, Schoffelen JM, Oostenveld R, Singer W, Desimone R, Engel AK, Fries P (2007) Modulation of neuronal interactions through neuronal synchronization. Science 316:1609-1612.2. Sejnowski TJ, Paulsen O (2006) Network oscillations: emerging computational principles. J Neurosci 26:1673-1676.3. Fries P, Nikolic D, Singer W (2007) The gamma cycle. Trends Neurosci 30:309-316.7. Conference: Computational and systems neuroscience 2009, Salt Lake City, UT, United States, 26 Feb - 3 Mar, 2009. Presentation Type: Poster Presentation Topic: Poster Presentations Citation: (2009). Precise spike synchronization in the gamma band increases information gain in awake monkey V1. Front. Syst. Neurosci. Conference Abstract: Computational and systems neuroscience 2009. doi: 10.3389/conf.neuro.06.2009.03.101 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 02 Feb 2009; Published Online: 02 Feb 2009. Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Google Google Scholar PubMed Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page." @default.
• W137603947 created "2016-06-24" @default.
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• W137603947 date "2009-01-01" @default.
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• W137603947 title "Precise spike synchronization in the gamma band increases information gain in awake monkey V1" @default.
• W137603947 doi "https://doi.org/10.3389/conf.neuro.06.2009.03.101" @default.
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