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.
journal_name
Biol Cybernjournal_title
Biological cyberneticsauthors
Doi S,Nabetani S,Kumagai Sdoi
10.1007/PL00007996keywords:
subject
Has Abstractpub_date
2001-07-01 00:00:00pages
51-64issue
1eissn
0340-1200issn
1432-0770journal_volume
85pub_type
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