Excitable Media — Spiral Wave Breakup & Fibrillation

Excitability (a): 0.75
Noise: 0.00
Diffusion: 0.50
Init Spiral Add Noise Tips: 0 | Phase: stable

FitzHugh-Nagumo excitable medium on a 2D grid. A single spiral wave rotates stably at low noise. As noise or excitability parameters push the system toward instability, the wavefront breaks up into multiple rotating spirals — a model for cardiac fibrillation. Tips count = number of spiral cores.