The system size here is twice as big as in the previous two demonstrations.

Note that all three demonstrations are at the same parameter values, showing that different states are possible depending on initial conditions.

These three demonstrations can be used as a very crude analogy to the type of dynamics believed to be important in the heart. The demonstrations then would roughly correspond in the ventricle to

• the naturally functioning muscle driven by signals from the atrioventricular node to give a regular beating;
• a self-sustained "re-entrant" state which is thought perhaps to manifest itself as a tachycardia arythmia;
• a disordered "re-entrant" state which might correspond to (fatal if not corrected!) fibrillation.