期刊
JOURNAL OF NEUROPHYSIOLOGY
卷 116, 期 4, 页码 1986-1999出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.00443.2016
关键词
primary visual cortex; V1; local field potential; high-gamma; LFP spread
资金
- Wellcome Trust/Department of Biotechnology (DBT) India Alliance [500145/Z/09/Z]
- Tata Trusts
- DBT-IISc Partnership Programme
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.
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