Description
Reduced set of FitzHugh-Nagumo oscillators (Stefanescu & Jirsa 2008). A low-dimensional description of globally coupled heterogeneous excitatory and inhibitory FitzHugh-Nagumo populations. The reduction projects an infinite population onto `number_of_modes` modes and yields per-mode scalar state variables (xi, eta) for the excitatory and (alpha, beta) for the inhibitory subnetwork. The mode-coupling matrices Aik, Bik, Cik and the per-mode inputs IE_i, II_i, m_i, n_i, e_i, f_i are derived offline by Gaussian quadrature over the heterogeneity distribution N(mu, sigma^2); see TVB reference implementation `tvb.simulator.models.stefanescu_jirsa.ReducedSetFitzHughNagumo`.