实验性神经起步点的不规则节律中的非稳定周期轨道

在大鼠坐骨神经结扎模型中，记录到放电节律以周期加方式相互转化，在确认了周期二与周期三之间的不规则节律具有混性质后，借助峰峰间期序列的回归映象方法，使用了一种测度增强算法，确认了此混沌放电中的非稳定周期轨道结构，提示出非稳定周期轨道在神经不规则放电节律的动力学之中起着重要作用。

THE UNSTABLE PERIODIC ORDITS IN THE IRREGULAR SPONTANEOUSLYFIRING PATTERN FROM EXPERIMENTAL NEURON PACEMAKER

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.