Figure 1.

Structure of the population model. A, Scheme of interacting neural populations. E, I: excitatory and inhibitory populations; $g_{EE}$, $g_{EI}$: excitatory to excitatory and excitatory to inhibitory maximal conductances; $g_{II}$, $g_{IE}$: inhibitory-to-inhibitory and inhibitory-to-excitatory maximal conductance; g_AHP: adaptation conductance in the excitatory population; $I_E\left(t\right)$: synaptic noise input to the excitatory population; AHP, afterhyperpolarization current (Buchin and Chizhov, 2010b). B, LFP model: ${\phi }_i$: contribution of a single excitatory cell; N: the number of neurons; $U_E$: the average membrane potential in the excitatory population. C, D, Sigmoid approximation of potential-to-rate function (Johannesma, 1968) of the excitatory (C) and inhibitory population (D).