神经元群简化模型的动态特性的研究

神经发放率的振荡和同步现象是视觉神经生理学的最新实验发现，也是Ｍａｌｓｂｕｒｇ等人关于物体感知的时间相关性神经群理论的重要假设。本文在神经元群简化模型动力学方程的基础上加以改进，研究了噪声对振荡的相关性和独立性的影响，取得与生物实验相似的结果；发现在具有时间结构的输入刺激下单个神经元群发放的锁频现象，进一步讨论了两个神经元群之间的同步现象及其机理。

THE DYNAMIC FEATURES OF A SIMPLIFIED NEURONAL GROUP MODEL

The oscillation and synchronization of neuronal firing rate are some of the recentdiscoveries of the visual neural physiology. These are also the basis for the hypothesis on theobject perception by the temporal coherency of neuronal groups. Based on the dynamicequations of simplified neuronal group models, which we have done some modifications, the influence of the noise on the coherency and dependency of the oscillations are investigated.The simulation results are consistent with those in the physiological experiments. We alsostudied the dependency of output of neuronal activities on the temporal structures of the input.The frequency-locking phenomenon of the neural firing rate was demonstrated. This phenomenon, which is typical in nonlinear systems, can occur only as the input possess temporal structure.The synchronization beweenn two groups and its possible mechanism are also discussed.