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Neuronal Shot Noise and Brownian 1/f2 Behavior in the Local Field Potential

AuthorsMilstein, Joshua; Mormann, Florian; Fried, Itzhak; Koch, Christof
KeywordsShot noise
Brownian noise
Local Field Potential
Issue Date3-Feb-2009
PublisherPublic Library of Science
CitationPLoS ONE. 2009; 4(2): e4338
AbstractWe demonstrate that human electrophysiological recordings of the local field potential (LFP) from intracranial electrodes, acquired from a variety of cerebral regions, show a ubiquitous 1/f2 scaling within the power spectrum. We develop a quantitative model that treats the generation of these fields in an analogous way to that of electronic shot noise, and use this model to specifically address the cause of this 1/f2 Brownian noise. The model gives way to two analytically tractable solutions, both displaying Brownian noise: 1) uncorrelated cells that display sharp initial activity, whose extracellular fields slowly decay in time and 2) rapidly firing, temporally correlated cells that generate UP-DOWN states.
Description5 pages, 4 figures.-- PMID: 19190760 [PubMed].-- PMCID: PMC2629847.
Publisher version (URL)http://dx.doi.org/10.1371/journal.pone.0004338
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