Doubly stochastic coherence via noise-induced symmetry in bistable neural models |
| |
Authors: | Zaikin A García-Ojalvo J Báscones R Ullner E Kurths J |
| |
Institution: | Institut für Physik, Potsdam Universit?t, Am Neuen Palais 10, D-14469 Potsdam, Germany. |
| |
Abstract: | The generation of coherent dynamics due to noise in an activator-inhibitor system describing bistable neural dynamics is investigated. We show that coherence can be induced in deterministically asymmetric regimes via symmetry restoration by multiplicative noise, together with the action of additive noise which induces jumps between the two stable steady states. The phenomenon is thus doubly stochastic, because both noise sources are necessary. This effect can be understood analytically in the frame of a small-noise expansion and is confirmed experimentally in a nonlinear electronic circuit. Finally, we show that spatial coupling enhances this coherent behavior in a form of system-size coherence resonance. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|