Complex nonlinear dynamics of the Hodgkin-Huxley equations induced by time scale changes |
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Authors: | Doi S Nabetani S Kumagai S |
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Institution: | (1) Department of Electrical Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, JP |
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Abstract: | The Hodgkin–Huxley equations with a slight modification are investigated, in which the inactivation process (h) of sodium channels or the activation process of potassium channels (n) is slowed down. We show that the equations produce a variety of action potential waveforms ranging from a plateau potential,
such as in heart muscle cells, to chaotic bursting firings. When h is slowed down – differently from the case of n variable being slow – chaotic bursting oscillations are observed for a wide range of parameter values although both variables
cause a decrease in the membrane potential. The underlying nonlinear dynamics of various action potentials are analyzed using
bifurcation theory and a so-called slow–fast decomposition analysis. It is shown that a simple topological property of the
equilibrium curves of slow and fast subsystems is essential to the production of chaotic oscillations, and this is the cause
of the large difference in global firing characteristics between the h-slow and n-slow cases.
Received: 9 August 2000 / Accepted in revised form: 10 January 2001 |
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