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Published on: August 14, 2015
Coherence resonance and polymodality in inhibitory coupled excitable oscillators
E I Volkov1, M N Stolyarov, A A Zaikin
1Department Theoretical Physics, Lebedev Physical Institute, Leninskii, Russia.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 26, 2005
Summary
We discovered a new type of coherence resonance in coupled FitzHugh-Nagumo oscillators, driven by antiphase dynamics and external noise. This coupling also generates rhythmic firing patterns and complex interspike distributions without external forcing.
Area of Science:
- Computational neuroscience
- Nonlinear dynamics
- Complex systems
Background:
- FitzHugh-Nagumo oscillators are simplified models of neuron firing.
- Coupled oscillators can exhibit complex emergent behaviors.
- Coherence resonance typically enhances signal regularity.
Purpose of the Study:
- To investigate coherence resonance in coupled FitzHugh-Nagumo oscillators.
- To explore rhythmogenesis and interspike distribution properties.
- To analyze the influence of noise and coupling strength.
Main Methods:
- Simulated firing activity of 2-3 coupled FitzHugh-Nagumo oscillators.
- Utilized slow variable diffusion for coupling.
- Applied external noise and analyzed system dynamics.
Main Results:
- Identified a novel coherence resonance based on antiphase dynamics.
- Demonstrated rhythmogenic coupling leading to polymodal interspike distributions.
- Observed dependence of distributions on noise amplitude and coupling strength.
Conclusions:
- Antiphase coupling in FitzHugh-Nagumo oscillators induces unique coherence resonance.
- This coupling mechanism is inherently rhythmogenic, producing complex firing patterns.
- Noise and coupling strength critically influence the emergent oscillatory dynamics.
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