Two paradigmatic scenarios for inverse stochastic resonance
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Date
2020-03-16
Authors
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Journal ISSN
Volume Title
Journal Title
Chaos: An Interdisciplinary Journal of Nonlinear Science
Volume Title
30
Article Title
033123
Publisher
American Institute of Physics Inc.
Abstract
Inverse stochastic resonance comprises a nonlinear response of an oscillatory system to noise where the frequency of noise-perturbed oscillations becomes minimal at an intermediate noise level. We demonstrate two generic scenarios for inverse stochastic resonance by considering a paradigmatic model of two adaptively coupled stochastic active rotators whose local dynamics is close to a bifurcation threshold. In the first scenario, shown for the two rotators in the excitable regime, inverse stochastic resonance emerges due to a biased switching between the oscillatory and the quasi-stationary metastable states derived from the attractors of the noiseless system. In the second scenario, illustrated for the rotators in the oscillatory regime, inverse stochastic resonance arises due to a trapping effect associated with a noise-enhanced stability of an unstable fixed point. The details of the mechanisms behind the resonant effect are explained in terms of slow–fast analysis of the corresponding noiseless systems.