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/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.
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机译：我们证明，人类的脑电记录从颅内电极，从各种大脑区域获得的局部场电势（LFP），显示在功率谱中普遍存在的1 / f 2 缩放。我们开发了一种量化模型，以类似于电子散粒噪声的方式处理这些场的产生，并使用该模型专门解决了1 / f 2 布朗噪声的原因。该模型让位于两个易于分析的解决方案，均显示布朗噪声：1）不相关的细胞显示出清晰的初始活性，其胞外场随时间缓慢衰减； 2）快速激发的时间相关性细胞，产生上-下状态。
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