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Spatial spread of local field potential is band-pass in the primary visual cortex

Dubey, Agrita and Ray, Supratim (2016) Spatial spread of local field potential is band-pass in the primary visual cortex. In: JOURNAL OF NEUROPHYSIOLOGY, 116 (4). pp. 1986-1999.

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Official URL: http://dx.doi.org/10.1152/jn.00443.2016


Local field potential (LFP) is a valuable tool in understanding brain function and in brain machine-interfacing applications. However, there is no consensus on the spatial extent of the cortex that contributes to the LFP (its ``spatial spread''), with different studies reporting values between a few hundred micrometers and several millimeters. Furthermore, the dependency of the spatial spread on frequency, which could reflect properties of the network architecture and extracellular medium, is not well studied, with theory and models predicting either ``all-pass'' (frequency-independent) or ``low-pass'' behavior. Surprisingly, we found the LFP spread to be ``band-pass'' in the primate primary visual cortex, with the greatest spread in the high-gamma range (60-150 Hz). This was accompanied by an increase in phase coherency across neighboring sites in the same frequency range, consistent with the findings of a recent model that reconciles previous studies by suggesting that spatial spread depends on neuronal correlations.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER PHYSIOLOGICAL SOC, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Date Deposited: 07 Dec 2016 06:00
Last Modified: 07 Dec 2016 06:00
URI: http://eprints.iisc.ac.in/id/eprint/55554

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