FitzHugh-Nagumo — Excitable Pulse Propagation
Click canvas to trigger excitation pulses • Reaction-diffusion in 1D
v (membrane voltage)
w (recovery variable)
Fire Pulse
Reset
Pause
Diffusion D
0.20
Excitability a
0.15
Recovery b
0.10
Time scale τ
8.0
∂v/∂t = D·∂²v/∂x² + v(v−a)(1−v) − w | ∂w/∂t = (1/τ)(bv − w)
The FitzHugh-Nagumo model is a simplified neuron model capturing excitability, pulse propagation, and refractory periods. Voltage v activates rapidly; recovery w inhibits slowly, creating one-way traveling waves. Click to inject stimulus.