Return Map Characterizations for a Model of Bursting with Two Slow Variables

Various physiological systems display bursting electrical activity (BEA). There exist numerous three‐variable models to describe this behavior. However, higher‐dimensional models with two slow processes have recently been used to explain qualitative features of the BEA of some experimentally observed systems [T. Chay and D. Cook, Math. Biosci., 90 (1988), pp. 139–153; P. Smolen and J. Keizer, J. Memb. Biol., 127 (1992), pp. 9–19; R. Bertram et al., Biophys. J., 79 (2000), pp. 2880–2892; R. Bertram et al., Biophys. J., 68 (1995), pp. 2323–2332; J. Keizer and P. Smolen, Proc. Nat. Acad. Sci. USA, 88 (1991), pp. 3897–3901]. In this paper we present a model with two slow and two fast variables. For some parameter values the system has stable equilibria, while for other values there exist bursting solutions. Singular perturbation methods are used to define a one‐dimensional return map, wherein fixed points correspond to singular bursting solutions. We analytically demonstrate that bursting solutions may exist ...

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