Dynamics of a stochastic excitable system with slowly adapting feedback

Abstract

We study an excitable active rotator with slowly adapting nonlinear feedback and noise. Depending on the adaptation and the noise level, this system may display noise-induced spiking, noise-perturbed oscillations, or stochastic busting. We show how the system exhibits transitions between these dynamical regimes, as well as how one can enhance or suppress the coherence resonance, or effectively control the features of the stochastic bursting. The setup can be considered as a paradigmatic model for a neuron with a slow recovery variable or, more generally, as an excitable system under the influence of a nonlinear control mechanism. We employ a multiple timescale approach that combines the classical adiabatic elimination with averaging of rapid oscillations and stochastic averaging of noise-induced fluctuations by a corresponding stationary Fokker-Planck equation. This allows us to perform a numerical bifurcation analysis of a reduced slow system and to determine the parameter regions associated with different types of dynamics. In particular, we demonstrate the existence of a region of bistability, where the noise-induced switching between a stationary and an oscillatory regime gives rise to stochastic bursting.

Generalized splay states in phase oscillator networks

“…Another generalization which has gained much attention in recent years concerns the phenomena in networks of phase oscillators with adaptive coupling. Several models have been proposed and studied to gain insights into the interplay between collective dynamics and adaptivity 18,20,21,[83][84][85][86][87][88][89][90][91] . Many of them were inspired by recent findings in neuroscience related to synaptic plasticity.…”