Qualitatively different bifurcation scenarios observed in the firing of identical nerve fibers

This Letter reports various bifurcation scenarios, including period-adding bifurcations with chaos and those with stochastic firing patterns, generated by identical neural pacemakers. The scenarios are studied by properly adjusting two physiological parameters, one is 4-aminopyridine sensitive potassium conductance and the other is extracellular calcium concentration, in both experimentation and simulation.