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神经放电节律在参数空间的分岔结构不仅是重要的动力学问题,对于揭示神经信息编码也具有重要的意义.在大鼠损伤坐骨神经模型,研究了不同K+通道阻断剂的浓度下神经自发放电随Ca2+浓度变化的分岔序列规律.结果发现,包含节律模式种类较少的简单分岔序列可以与包含多类周期和混沌的复杂分岔序列相互转换,复杂分岔序列之间也可以转换.分岔点附近的混沌节律的不同是识别分岔序列不同的主要标志.研究结果不仅丰富了神经放电的非线性动力学现象,也会为建立神经放电在参数空间的分岔序列结构进而揭示神经编码机制提供帮助.
The bifurcation structure of neural firing rhythm in parametric space is not only an important kinetic problem but also plays an important role in revealing the coding of nerve information.After the injury of sciatic nerve model in rats and the spontaneous discharge of nerve under different K + channel blockers The results show that simple bifurcation sequences with fewer types of rhythm patterns can be converted from complex bifurcation sequences containing many kinds of periods and chaos, and complex bifurcation sequences can also be converted. The difference of chaotic rhythms near the bifurcation point is the main symbol to identify the different bifurcation sequences.The research results not only enrich the nonlinear dynamic phenomena of nerve discharge but also reveal the neural structure of bifurcation sequence of nerve discharge in parameter space Coding mechanism to help.