外电场作用下改进的Leaky Integrate-And-Fire模型的峰放电频率适应性研究  

SPIKE-FREQUENCY ADAPTATION IN THE MODIFIED LEAKY INTEGRATE-AND-FIRE MODEL UNDER EXTERNAL ELECTRIC FIELD

作　　者：韩春晓[1] 王江[2] 常莉[2] 车艳秋[1] 

机构地区：[1]天津职业技术师范大学自动化与电气工程学院 [2]天津大学电气与自动化工程学院

出　　处：《动力学与控制学报》2013年第1期46-52,共7页Journal of Dynamics and Control

基　　金：国家自然科学基金资助项目(61104032;61072012;61172009;50907044);学校科研启动经费项目(KYQD11005)~~

摘　　要：峰放电频率适应性是神经元在信息处理过程中重要的动力学特性之一.当神经系统受到外电场作用时,会对其动力学行为以及神经电信息的产生、传导产生影响.我们基于Leaky integrate-and-fire(LIF)神经元模型,建立了外电场作用下改进的LIF神经元模型.采用随时间演化的膜电位曲线和峰放电频率曲线,以及随外电场变化的起始峰放电频率曲线和稳态峰放电频率曲线,研究不同强度、频率外电场作用下改进的LIF模型的适应性变化.此外,还利用相邻峰峰间期(ISI)之间的相关性进一步阐明外电场对神经元适应性的影响.Spike frequency adaptation is a prominent property of neuronal dynamics in neural information processing. The external electric field has effect on the generation and conduction of neural information, and the dynamic behaviors of the neural system. Based on the leaky integrate and fire （LIF） model, a modified LIF model under the external electric field is established. From the membrane potential curve and the spike frequency curve along with the time evolution process, the onset spike frequency curve and the steady state spike frequency curve along with the external electric field changes, and the correlation between successive inter spike intervals （ISIs）, the effect of external electrical field with different strength or frequency on the adaptability of the proposed model is discussed.

关 键 词：峰放电频率适应性 外电场 Leaky integrate—and—fire模型 ISI 相关性 

分 类 号：O441[理学—电磁学]