Papers › Stability and bifurcations in Wilson-Cowan systems with distributed delays, and an...
Stability and bifurcations in Wilson-Cowan systems with distributed delays, and an application to basal ganglia interactions
Eva Kaslik, Emanuel-Attila Kokovics, Anca Radulescu
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The traditional Wilson-Cowan model of excitatory and inhibitory mean field interactions in neuronal populations considers a weak Gamma distribution of time delays when processing inputs, and is obtained via a time-coarse graining technique that averages the population response. Previous analyses of the stability of the Wilson-Cowan model focused on more simplified cases, where the delays were either not present, constant or were of a specific type. Since these simplifications may significantly alter the behavior of the model, we focus on understanding the behavior of the system before time-course graining, and for a wider range of delay distributions. For these generalized delay equations, we perform stability and bifurcation analyses with respect to parameters that capture both the coupling profile, and the time delay. The investigation is done through the examination of the system's associated characteristic equation. Under mild assumptions, we give complete mathematical proofs of our theoretical results, for the model with general delay distributions and prove the transversality condition for the possible Hopf bifurcations, in a generalized context. The stability region in this parameter space is described theoretically for several types of delay kernels, and numerical simulations are presented to substantiate the theoretical results. We illustrate these theoretical principles in an application to a basal ganglia circuit, in which β-band oscillations have been associated with Parkinson's Disease.
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