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The nonlinear mechanism for the same responses of neuronal bursting to opposite self-feedback modulations of autapse

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Science China(Technological Sciences) 2021年第7期64卷 1459-1471页

作者： LI YuYe GU HuaGuang JIA Bing DING XueLi College of Mathematics and Computer Science Chifeng UniversityChifeng024000China School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai200092China Department of Physiology and Biophysics School of Life SciencesFudan UniversityShanghai200438China Department of Basic Education Fuyang Institute of TechnologyFuyang236031China

In the traditional viewpoint,inhibitory and excitatory effects always induce opposite *** the present study,the enhanced bursting activities induced by excitatory autapses,which are consistent with the recent experimental observations,and those induced by inhibitory autapses,which is a paradoxical phenomenon,were simulated using the Chay *** same bifurcations and different ionic currents for the same responses were acquired with fast-slow variable dissection and current decomposition,*** the inhibitory or excitatory autaptic conductance increased,the ending phase of the burst related to a homoclinic bifurcation of the fast subsystem changed to widen the burst duration to contain more spikes,which was induced by an elevated minimal potential(V_(min)) of spiking of the fast *** inhibitory and excitatory autaptic conductances induced smaller and larger maximal potentials(V_(max)) of spiking,*** the downstroke,a weaker potassium current induced by the smaller V_(max) played a dominant role for the inhibitory autapse,and the stronger potassium current induced by the larger V_(max) became weaker due to the opposite autaptic current of the excitatory autapse,which induced the V_(min) *** results present the nonlinear and biophysical mechanisms of the same responses to opposite effects,which extends nonlinear dynamics knowledge and provides potential modulation measures for the nervous system.

关键词： bifurcation bursting autapse inhibitory effect excitatory effect fast-slow variable dissection

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