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pro vyhledávání: '"Bedard, Claude"'
Autor:
Bedard, Claude, Destexhe, Alain
The macroscopic electric permittivity of a given medium may depend on frequency, but this frequency dependence cannot be arbitrary, its real and imaginary parts are related by the well-known Kramers-Kronig relations. Here, we show that an analogous p
Externí odkaz:
http://arxiv.org/abs/1801.00461
Publikováno v:
Journal of Integrative Neuroscience 16: 3-18, 2017
In this viewpoint article, we discuss the electric properties of the medium around neurons, which are important to correctly interpret extracellular potentials or electric field effects in neural tissue. We focus on how these electric properties shap
Externí odkaz:
http://arxiv.org/abs/1611.10047
Autor:
Gomes, Jean-Marie, Bedard, Claude, Valtcheva, Silvana, Nelson, Matthew, Khokhlova, Vitalia, Pouget, Pierre, Venance, Laurent, Bal, Thierry, Destexhe, Alain
Publikováno v:
Biophysical Journal 110: 234-246, 2016
The electrical properties of extracellular space around neurons are important to understand the genesis of extracellular potentials, as well as for localizing neuronal activity from extracellular recordings. However, the exact nature of these extrace
Externí odkaz:
http://arxiv.org/abs/1507.07317
Autor:
Bedard, Claude, Destexhe, Alain
Publikováno v:
Physical Review E 90: 042723 (2014)
Neurons generate magnetic fields which can be recorded with macroscopic techniques such as magneto-encephalography. The theory that accounts for the genesis of neuronal magnetic fields involves dendritic cable structures in homogeneous resistive extr
Externí odkaz:
http://arxiv.org/abs/1407.2480
Autor:
Bedard, Claude, Destexhe, Alain
Publikováno v:
Physical Review E 88: 022709, 2013
Cable theory has been developed over the last decades, usually assuming that the extracellular space around membranes is a perfect resistor. However, extracellular media may display more complex electrical properties due to various phenomena, such as
Externí odkaz:
http://arxiv.org/abs/1304.5674
Autor:
Bedard, Claude, Destexhe, Alain
Publikováno v:
Physical Review E 84: 041909 (2011)
The current-source density (CSD) analysis is a widely used method in brain electrophysiology, but this method rests on a series of assumptions, namely that the surrounding extracellular medium is resistive and uniform, and in some versions of the the
Externí odkaz:
http://arxiv.org/abs/1101.1094
The resistive or non-resistive nature of the extracellular space in the brain is still debated, and is an important issue for correctly modeling extracellular potentials. Here, we first show theoretically that if the medium is resistive, the frequenc
Externí odkaz:
http://arxiv.org/abs/1003.5538
We examine the properties of the transfer function F_T = V_m / V_{LFP} between the intracellular membrane potential (V_m) and the local field potential (V_{LFP}) in cerebral cortex. We first show theoretically that, in the subthreshold regime, the fr
Externí odkaz:
http://arxiv.org/abs/0908.3268
Autor:
Bedard, Claude, Destexhe, Alain
Publikováno v:
Biophysical Journal 96: 2589-2603, 2009.
The power spectrum of local field potentials (LFPs) has been reported to scale as the inverse of the frequency, but the origin of this "1/f noise" is at present unclear. Macroscopic measurements in cortical tissue demonstrated that electric conductiv
Externí odkaz:
http://arxiv.org/abs/0808.3853
Autor:
Bedard, Claude, Destexhe, Alain
Publikováno v:
Biophysical Journal 2008 Feb 15;94(4):1133-43. Epub 2007 Oct 5
Intracellular recordings of cortical neurons in vivo display intense subthreshold membrane potential (Vm) activity. The power spectral density (PSD) of the Vm displays a power-law structure at high frequencies (>50 Hz) with a slope of about -2.5. Thi
Externí odkaz:
http://arxiv.org/abs/0705.3759