Local and global synchronization transitions induced by time delays in small-world neuronal networks with chemical synapses
Local and global synchronization transitions induced by time delays in small-world neuronal networks with chemical synapses
复制标题
具有化学突触的小世界神经元网络中的时间延迟引起的局部和全局同步转换
DOI：
10.1007/s11571-014-9310-4
复制
发表时间：
2015-02-01
影响因子：
3.7
通讯作者：
Wei, Xile
中科院分区：
文献类型：
--
作者：
Yu, Haitao;Wang, Jiang;Wei, Xile
研究了时滞对具有化学突触的小世界神经元网络局部和全局同步的影响。数值结果表明，无论是兴奋性耦合还是抑制性耦合，信息传递延迟都能诱导小世界网络中发放神经元的同步化跃迁。特别是，随着突触延迟的增加，连接神经元的同相和异相同步区域间歇性地出现。对于兴奋性耦合，所有的过渡到尖峰同步大约发生在整数倍的个别神经元的放电周期;而抑制性耦合，这些过渡出现在奇数倍的一半的放电周期的神经元。更重要的是，局部同步转换比全局同步转换更深刻，这取决于耦合突触的类型。对于兴奋性突触，局部同步观察到的一些值的延迟也发生在全球范围内，而抑制性的，这种同步，在当地的规模，在全球范围内消失。此外，小世界结构也可以影响神经网络的相位同步。结果表明，增加重连概率总是可以提高神经元活动的全局同步性，但对相邻神经元的局部同步性影响不大。
Effects of time delay on the local and global synchronization in small-world neuronal networks with chemical synapses are investigated in this paper. Numerical results show that, for both excitatory and inhibitory coupling types, the information transmission delay can always induce synchronization transitions of spiking neurons in small-world networks. In particular, regions of in-phase and out-of-phase synchronization of connected neurons emerge intermittently as the synaptic delay increases. For excitatory coupling, all transitions to spiking synchronization occur approximately at integer multiples of the firing period of individual neurons; while for inhibitory coupling, these transitions appear at the odd multiples of the half of the firing period of neurons. More importantly, the local synchronization transition is more profound than the global synchronization transition, depending on the type of coupling synapse. For excitatory synapses, the local in-phase synchronization observed for some values of the delay also occur at a global scale; while for inhibitory ones, this synchronization, observed at the local scale, disappears at a global scale. Furthermore, the small-world structure can also affect the phase synchronization of neuronal networks. It is demonstrated that increasing the rewiring probability can always improve the global synchronization of neuronal activity, but has little effect on the local synchronization of neighboring neurons.