Affordable Access

Noise-enhanced excitability in bistable activator-inhibitor media

Physical Review E
American Physical Society
Publication Date
  • Física Estadística
  • Termodinàmica
  • Sistemes Dinàmics Diferenciables
  • Biofísica
  • Física Mèdica
  • Biological And Medical Physics
  • Statistical Physics
  • Thermodynamics
  • Differentiable Dynamical Systems
  • Biophysics
  • Medical Physics
  • Mathematics


We show that external fluctuations induce excitable behavior in a bistable spatially extended system with activator-inhibitor dynamics of the FitzHugh-Nagumo type. This can be understood as a mechanism for sustained signal propagation in bistable media. The phase diagram of the stochastic system is analytically obtained and numerically verified. For small-noise intensities, front propagation becomes unstable, and excitable pulses arise as the only possible spatiotemporal behavior of the system. For large-noise intensities, on the other hand, the system enters an effective regime of oscillatory behavior, where it exhibits spontaneous nucleation of pulses and synchronized firing.

There are no comments yet on this publication. Be the first to share your thoughts.