ECoG observations of power-law scaling in the human cortex
| dc.creator | Miller, Kai J. | |
| dc.creator | Sorensen, Larry B. | |
| dc.creator | Ojemann, Jeffrey G. | |
| dc.creator | Nijs, Marcel den | |
| dc.date | 2007-12-05 | |
| dc.date.accessioned | 2026-07-07T08:48:05Z | |
| dc.date.available | 2026-07-07T08:48:05Z | |
| dc.description | We report the results of our search for power-law electrical signals in the human brain, using subdural electrocorticographic recordings from the surface of the cortex. The power spectral density (PSD) of these signals has the power-law form $ P(f)\sim f^{-χ} $ from 80 to 500 Hz. This scaling index $χ= 4.0\pm 0.1$ is universal, across subjects, area in the cortex, and local neural activity levels. The shape of the PSD does not change with local cortex activity, only its amplitude increases. We observe a knee in the spectra at $f_0\simeq 70$ Hz, implying the existence of a characteristic time scale $τ=(2πf_0)^{-1}\simeq 2-4$ msec. For $f<f_0$ we find evidence for a power-law with $χ_L\simeq 2.0\pm 0.4$. | |
| dc.description | 4 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/0712.0846 | |
| dc.identifier | http://arxiv.org/abs/0712.0846 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/143823 | |
| dc.subject | Neurons and Cognition | |
| dc.subject | Other Condensed Matter | |
| dc.title | ECoG observations of power-law scaling in the human cortex | |
| dc.type | text |