On the estimation of population-specific synaptic currents from laminar multielectrode recordings
Multielectrode array recordings of extracellular electrical field potentials along the depth axis of the cerebral cortex is an up-and-coming approach for investigating activity of cortical neuronal circuits. The low-frequency band of extracellular potential, i.e., the local field potential (LFP), is...
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Frontiers Media S.A.
2011-12-01
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doaj-1c1068e8b70a4a859d43819ac3dbccb72020-11-24T23:16:13ZengFrontiers Media S.A.Frontiers in Neuroinformatics1662-51962011-12-01510.3389/fninf.2011.0003212089On the estimation of population-specific synaptic currents from laminar multielectrode recordingsSergey L Gratiy0Anna eDevor1Anna eDevor2Anna eDevor3Gaute T Einevoll4Anders M Dale5Anders M Dale6University of California, San DiegoUniversity of California, San DiegoMGH, Harvard Medical SchoolUniversity of California, San DiegoNorwegian University of Life SciencesUniversity of California, San DiegoUniversity of California, San DiegoMultielectrode array recordings of extracellular electrical field potentials along the depth axis of the cerebral cortex is an up-and-coming approach for investigating activity of cortical neuronal circuits. The low-frequency band of extracellular potential, i.e., the local field potential (LFP), is assumed to reflect the synaptic activity and can be used to extract the current source density (CSD) profile. However, physiological interpretation of CSD profiles is uncertain because the analysis does not disambiguate synaptic inputs from passive return currents. Here we present a novel mathematical framework for identifying excited neuronal populations and for separating synaptic input currents from return currents based on LFP recordings. This involves a combination of the linear forward model, which predicts population-specific laminar LFP in response to sinusoidal synaptic inputs applied at different locations along the population cells having realistic morphologies and the linear inverse model, which reconstructs laminar profiles of synaptic inputs from the Fourier spectrum of the laminar LFP data based on the forward prediction. The model allows reconstruction of synaptic input profiles on a spatial scale comparable to known anatomical organization of synaptic projections within a cortical column. Assuming spatial correlation of synaptic inputs within individual populations, the model decomposes the columnar LFP into population-specific contributions. Constraining the solution with a priori knowledge of the spatial distribution of synaptic connectivity further allows prediction of active projections from the composite LFP profile. This modeling framework successfully delineates the main relationships between the synaptic input currents and the evoked LFP and can serve as a foundation for modeling more realistic processing of active dendritic conductances.http://journal.frontiersin.org/Journal/10.3389/fninf.2011.00032/fulllocal field potentialcortical columnsynaptic activityinverse problemCurrent Source Densityextracellular potential |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sergey L Gratiy Anna eDevor Anna eDevor Anna eDevor Gaute T Einevoll Anders M Dale Anders M Dale |
spellingShingle |
Sergey L Gratiy Anna eDevor Anna eDevor Anna eDevor Gaute T Einevoll Anders M Dale Anders M Dale On the estimation of population-specific synaptic currents from laminar multielectrode recordings Frontiers in Neuroinformatics local field potential cortical column synaptic activity inverse problem Current Source Density extracellular potential |
author_facet |
Sergey L Gratiy Anna eDevor Anna eDevor Anna eDevor Gaute T Einevoll Anders M Dale Anders M Dale |
author_sort |
Sergey L Gratiy |
title |
On the estimation of population-specific synaptic currents from laminar multielectrode recordings |
title_short |
On the estimation of population-specific synaptic currents from laminar multielectrode recordings |
title_full |
On the estimation of population-specific synaptic currents from laminar multielectrode recordings |
title_fullStr |
On the estimation of population-specific synaptic currents from laminar multielectrode recordings |
title_full_unstemmed |
On the estimation of population-specific synaptic currents from laminar multielectrode recordings |
title_sort |
on the estimation of population-specific synaptic currents from laminar multielectrode recordings |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Neuroinformatics |
issn |
1662-5196 |
publishDate |
2011-12-01 |
description |
Multielectrode array recordings of extracellular electrical field potentials along the depth axis of the cerebral cortex is an up-and-coming approach for investigating activity of cortical neuronal circuits. The low-frequency band of extracellular potential, i.e., the local field potential (LFP), is assumed to reflect the synaptic activity and can be used to extract the current source density (CSD) profile. However, physiological interpretation of CSD profiles is uncertain because the analysis does not disambiguate synaptic inputs from passive return currents. Here we present a novel mathematical framework for identifying excited neuronal populations and for separating synaptic input currents from return currents based on LFP recordings. This involves a combination of the linear forward model, which predicts population-specific laminar LFP in response to sinusoidal synaptic inputs applied at different locations along the population cells having realistic morphologies and the linear inverse model, which reconstructs laminar profiles of synaptic inputs from the Fourier spectrum of the laminar LFP data based on the forward prediction. The model allows reconstruction of synaptic input profiles on a spatial scale comparable to known anatomical organization of synaptic projections within a cortical column. Assuming spatial correlation of synaptic inputs within individual populations, the model decomposes the columnar LFP into population-specific contributions. Constraining the solution with a priori knowledge of the spatial distribution of synaptic connectivity further allows prediction of active projections from the composite LFP profile. This modeling framework successfully delineates the main relationships between the synaptic input currents and the evoked LFP and can serve as a foundation for modeling more realistic processing of active dendritic conductances. |
topic |
local field potential cortical column synaptic activity inverse problem Current Source Density extracellular potential |
url |
http://journal.frontiersin.org/Journal/10.3389/fninf.2011.00032/full |
work_keys_str_mv |
AT sergeylgratiy ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings AT annaedevor ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings AT annaedevor ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings AT annaedevor ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings AT gauteteinevoll ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings AT andersmdale ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings AT andersmdale ontheestimationofpopulationspecificsynapticcurrentsfromlaminarmultielectroderecordings |
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