Snakes and ladders in an inhomogeneous neural field model

Avitabile, Daniele; Schmidt, Helmut

doi:10.1016/j.physd.2014.11.007

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Snakes and ladders in an inhomogeneous neural field model

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Avitabile, D., & Schmidt, H. (2015). Snakes and ladders in an inhomogeneous neural field model. Physica D: Nonlinear Phenomena, 294, 24-36. doi:10.1016/j.physd.2014.11.007.

Cite as: https://hdl.handle.net/21.11116/0000-0003-4F29-8

Abstract

Continuous neural field models with inhomogeneous synaptic connectivities are known to support traveling fronts as well as stable bumps of localized activity. We analyze stationary localized structures in a neural field model with periodic modulation of the synaptic connectivity kernel and find that they are arranged in a snakes-and-ladders bifurcation structure. In the case of Heaviside firing rates, we construct analytically symmetric and asymmetric states and hence derive closed-form expressions for the corresponding bifurcation diagrams. We show that the approach proposed by Beck and co-workers to analyze snaking solutions to the Swift–Hohenberg equation remains valid for the neural field model, even though the corresponding spatial–dynamical formulation is non-autonomous. We investigate how the modulation amplitude affects the bifurcation structure and compare numerical calculations for steep sigmoidal firing rates with analytic predictions valid in the Heaviside limit.