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The time constant cumulatively express the kinetics of neuronal and glial voltage-gated channels, as well as the scales of glial intracellular processes evoked by neuronal activity.  \subsection {Cumulative LFP model}  The contributions of potassium currents through mebranes of both neurons and glial cells are added, thus additive. Thus taking into account e.(\ref{1}), we get  \begin{equation} \label{e4}  \varphi(t) = \varphi_N(t) k_N \bigl(V_d(t)-V_s(t)\bigr)  + \varphi_G(t) \end{equation}  where $k_N={p}/{2\, \sigma \, r_{i} }$.  A set of equations (\ref{e1}), (\ref{e3}) and (\ref{e4}) determines the LFP model.