The FitzHugh-Nagumo model. 1D oscillating waves

This oscillating system (with negative a) is exitated at t = 0 near its center. This region synchronizes all the rest oscillators making a pacemaker.
a b ε Δt Δx D

delay Ymin Ymax it fps
This script uses simple explicit algorithm. It makes it time steps Δt per frame.
Heart rhythms     updated 24 Dec 2011