THE BIFURCATION AND INTEGER MULTIPLE SPIKING IN THEEXPERIMENTAL NEURONAL PACEMAKERS
实验性神经起步点自发放电的分叉和整数倍节律

The period-adding bifurcation and the integer multiple spiking were observed in the experiments on the neuronal pacemakers when the extracellar concentrations of Ca2 was changed. And the numerical simulation was done through both the deterministic model and the stochastic model. The results show that the period-adding bifurcation obeys the deterministic mechanism decribed by Chay model and lightly affected by stochastic factors. In the corresponding parameter region, the integer multiple spiking generates only when the stochastic factors are introduced to the model. The phenomenon is autonomous stochastic resonance. The generation of the integer multiple spiking is the interaction between the deterministic mechanism and the stochastic factors. The results revealed that the generation of the bifurcation and stochastic resonance is natural. It obeys the deterministic mechanism and is influenced by the stochastic factors, which play different roles in different parameter region.