THE UNSTABLE PERIODIC ORDITS IN THE IRREGULAR SPONTANEOUSLYFIRING PATTERN FROM EXPERIMENTAL NEURON PACEMAKER
实验性神经起步点的不规则节律中的非稳定周期轨道

The period-adding bifurcation of firing dynamics was observed in the experimental model obtained from the ligated sciatic nerve. After the chaotic character of interspike interval series of the irregular firing patterns between period two and three pattern was confirmed, the unstable periodic orbits(UPO) were identified from the series by using return map and a nature measure enhancement method. These results suggest that the UPO play an important role in the dynamics of the irregular firing pattern of neuron's discharge.