BIFURCATION SCENARIO RHYTHM IN THE FIRING PATTERN TRANSITION OF A NEURAL PACEMAKER
神经起步点自发放电节律及节律转化的分岔规律

Abundant neural firing patterns were observed in the experimental neural pacemaker, such as periodic bursting, periodic spiking, chaotic bursting, chaotic spiking and stochastic rhythm. The neural firing rhythm changed from period 1 bursting to period 1 spiking via a complex bifurcation scenario, in which period-doubling bifurcation to chaotic bursting, chaotic bursting to chaotic spiking via crisis and chaotic spiking to period spiking via inverse period-doubling bifurcation were exhibited, when extracellar calcium concentration (Ca2+]a) was decreased. In the relevant theoretical neuronal model such as Chay model, neural firing patterns and firing pattern transition regularity similar to the experiment were observed when the physiological parameters was changed. The results not only showed the regularity of neural firing bifurcation scenario in real neuronal system, but also provided a theoretical foundation for the study of neural coding.