Neuronal shot noise and Brownian 1/f2 behavior in the local field potential.
We 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/f(2) 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/f(2) 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.
Milstein
Joshua
J
California Institute of Technology, Pasadena, California, United States of America. milstein@caltech.edu
Mormann
Florian
F
Fried
Itzhak
I
Koch
Christof
C
D000200:Action Potentials / Q000502:physiology*; D000328:Adult; D001696:Biomechanical Phenomena; D002540:Cerebral Cortex / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology*; D013569:Synapses; D013997:Time Factors