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  Controlling the oscillation phase through precisely timed closed-loop optogenetic stimulation: a computational study

Witt, A., Palmigiano, A., Neef, A., El Hady, A., Wolf, F., & Battaglia, D. (2013). Controlling the oscillation phase through precisely timed closed-loop optogenetic stimulation: a computational study. Frontiers in Neural Circuits, 7: 49. doi:10.3389/fncir.2013.00049.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0FFB-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0FFC-D
Genre: Journal Article

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 Creators:
Witt, Annette1, Author              
Palmigiano, Agostina2, Author              
Neef, Andreas2, Author              
El Hady, Ahmed2, Author              
Wolf, Fred1, 2, Author              
Battaglia, Demian1, Author              
Affiliations:
1Department of Nonlinear Dynamics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063286              
2Research Group Theoretical Neurophysics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063289              

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 Abstract: Dynamic oscillatory coherence is believed to play a central role in flexible communication between brain circuits. To test this communication-through-coherence hypothesis, experimental protocols that allow a reliable control of phase-relations between neuronal populations are needed. In this modeling study, we explore the potential of closed-loop optogenetic stimulation for the control of functional interactions mediated by oscillatory coherence. The theory of non-linear oscillators predicts that the efficacy of local stimulation will depend not only on the stimulation intensity but also on its timing relative to the ongoing oscillation in the target area. Induced phase-shifts are expected to be stronger when the stimulation is applied within specific narrow phase intervals. Conversely, stimulations with the same or even stronger intensity are less effective when timed randomly. Stimulation should thus be properly phased with respect to ongoing oscillations (in order to optimally perturb them) and the timing of the stimulation onset must be determined by a real-time phase analysis of simultaneously recorded local field potentials (LFPs). Here, we introduce an electrophysiologically calibrated model of Channelrhodopsin 2 (ChR2)-induced photocurrents, based on fits holding over two decades of light intensity. Through simulations of a neural population which undergoes coherent gamma oscillations—either spontaneously or as an effect of continuous optogenetic driving—we show that precisely-timed photostimulation pulses can be used to shift the phase of oscillation, even at transduction rates smaller than 25%. We consider then a canonic circuit with two inter-connected neural populations oscillating with gamma frequency in a phase-locked manner. We demonstrate that photostimulation pulses applied locally to a single population can induce, if precisely phased, a lasting reorganization of the phase-locking pattern and hence modify functional interactions between the two populations.

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Language(s): eng - English
 Dates: 2013-04-17
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Internal
 Identifiers: eDoc: 673686
DOI: 10.3389/fncir.2013.00049
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Title: Frontiers in Neural Circuits
  Alternative Title : Front. Neural Circuits
Source Genre: Journal
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Pages: - Volume / Issue: 7 Sequence Number: 49 Start / End Page: - Identifier: -