外界电场激励下的耦合FitzHugh-Nagumo神经元系统的放电节律研究

Fire patterns of coupled FitzHugh-Nagumo neurons exposed to external electric field

研究了单向耦合连接的两个FitzHugh-Nagumo神经元系统的动力学行为.随外激频率的变化,系统表现出p:q锁相(一种周期振荡,q周期刺激产生p周期动作电位),且锁相是否发生与放电状态有关.研究表明外激频率和耦合强度都可以引起系统峰峰间期(interspike Interval,ISI)分岔,而外激频率对系统放电节律的影响更为明显,研究还发现混沌态是其他放电状态的过渡态.

This paper investigates the dynamic behavior of the two coupled FitzHugh-Nagumo neurons connected by coupling.The system exhibits p∶q phase-locked（i.e.a periodic oscillation defined as p action potentials generated by q cycle stimulations） depending on the value of stimulus frequency.Whether phase-locking occurs or not relies on the fire patterns of the system.Furthermore,the stimulus frequency and coupling intensity can stir up rich bifurcation respectively,and the stimulus frequency affects the system fire patterns more obviously.The study has also found that chaotic behavior is the transition state to other fire patterns.