Oversampling method to extract excitatory and inhibitory conductances from single-trial membrane potential recordings.

Claude Bédard, Sébastien Béhuret, Charlotte Deleuze, Thierry Bal and Alain Destexhe

J. Neurosci. Methods 210: 3-14, 2012.

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Abstract

Variations of excitatory and inhibitory conductances determine the membrane potential (Vm) activity of neurons, as well as their spike responses, and are thus of primary importance. Methods to estimate these conductances require clamping the cell at several different levels of Vm, thus making it impossible to estimate conductances from "single trial'' Vm recordings. We present here a new method that allows extracting estimates of the time course excitatory and inhibitory conductances from single-trace Vm recordings. This method is based on oversampling of the Vm. We test the method numerically using models of increasing complexity. Finally, the method is evaluated using controlled conductance injection in cortical neurons in vitro using the dynamic-clamp technique. This conductance extraction method should be very useful for future in vivo applications.

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