A Discrete Model of Excitable Media

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This Demonstration implements a model of excitable media. Space is represented as a grid of cells. Each cell can be in any of three states: (1) quiescent, (2) excited, or (3) refractory. A quiescent cell (white) becomes excited (green) if at least two of its neighbors are excited, then becomes refractory (yellow) at the next iteration. A refractory cell has a chance to become quiescent again with a fixed probability at every iteration.