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\bigl(V_d(t)-V_s(t)\bigr) +   k_1 ~\nu(t)  \end{equation}  where $V_s(t)$ and $V_d(t)$ are the somatic and dendritic neuronal membrane potentials; neurons are homogeneously distributed with  the density $p$ per area; $r_{i} $ is the specific intracellular resistivity; $\sigma $ is the mean conductivity of extracellular medium, assumed to be a constant; $\nu(t)$ is the firing rate; $k_1$ is a coefficient.