Bifurcation of orbits and synchrony in inferior olive neurons
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- 作者：Keum W. Lee (1) kwlee@kwandong.ac.kr
Sahjendra N. Singh (2) sahaj@egr.unlv.edu - 关键词：Inferior olive neurons – ; Bifurcation of orbits – ; Synchronization – ; Linear and nonlinear control
- 刊名：Journal of Mathematical Biology
- 出版年：2012
- 出版时间：September 2012
- 年：2012
- 卷：65
- 期：3
- 页码：465-491
- 全文大小：3.0 MB
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- ISSN：1432-1416
文摘
Inferior olive neurons (IONs) have rich dynamics and can exhibit stable, unstable, periodic, and even chaotic trajectories. This paper presents an analysis of bifurcation of periodic orbits of an ION when its two key parameters (a, μ) are varied in a two-dimensional plane. The parameter a describes the shape of the parabolic nonlinearity in the model and μ is the extracellular stimulus. The four-dimensional ION model considered here is a cascade connection of two subsystems (S a and S b ). The parameter plane (a − μ) is delineated into several subregions. The ION has distinct orbit structure and stability property in each subregion. It is shown that the subsystem S a or S b undergoes supercritical Poincare–Andronov–Hopf (PAH) bifurcation at a critical value μ c (a) of the extracellular stimulus and periodic orbits of the neuron are born. Based on the center manifold theory, the existence of periodic orbits in the asymptotically stable S a , when the subsystem S b undergoes PAH bifurcation, is established. In such a case, both subsystems exhibit periodic orbits. Interestingly when S b is under PAH bifurcation and S a is unstable, the trajectory of S a exhibits periodic bursting, interrupted by periods of quiescence. The bifurcation analysis is followed by the design of (i) a linear first-order filter and (ii) a nonlinear control system for the synchronization of IONs. The first controller uses a single output of each ION, but the nonlinear control system uses two state variables for feedback. The open-loop and closed-loop responses are presented which show bifurcation of orbits and synchronization of oscillating neurons.