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 Dab Inserts 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 Wooden Kit display sharp initial activity, whose extracellular fields slowly decay in time and 2) rapidly firing, temporally correlated cells that generate UP-DOWN states.