Objective: The firing patterns of inhibitory Interneurons in the neocortex are researched in this paper. Methods: Through FS mode, the numerical analysis on the firing patterns of among inhibitory neurons in the neocortex as well as the transformation among the patterns was made according to the change of parameters in Na ion. Hi addition, various kinds of period bifurcation phenomenon were displayed by ISIs. Results and Conclusions: The analysis results showed that there were apparent period doubling bifurcation and period adverse doubling bifurcation following the change of parameters in Na ion. Furthermore, after period doubling bifurcation and period adverse doubling bifurcation, the firing patterns returned to 1 period firing pattern. From the three-dimensional figures of gate variable of Na, with the increasing of &, different bifurcation figures had the characteristics of similarity and time delay.%目的:通过分析FS模型来探索皮层抑制性中间神经元放电的规律.方法:数值分析钠离子通道参数改变的情况下,皮层中间神经元的发放模式以及不同发放模式之间的转移,并通过峰峰间距(InterSpike Intervals,ISIs)序列展示了不同发放模式转移过程中出现的各种周期分岔现象.结果与结论:随着钠通道参数的改变,出现了明显的倍周期分岔和逆倍周期分岔现象,并且最终发放模型从分岔模式回归到周期1簇的放电模式.从钠通道门变量m的三维分岔图得出,随着gd的增加,不同分岔图之间出现相似性,具有延缓特性.
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