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Dynamics of the FHN model as α and λ change. A1, B1, and C1: voltage traces. A2, B2, and C2: phase planes. A3 and A4, B3 and B4, and C3 and C4: v-speed graphs. α = 4, λ = 0.1, T = 107.8, DC = 0.24 (A). α = 4, λ = 1.5, T = 78.2, DC = 0.5 (B). α = 2, λ = 0.1, T = 177.4, DC = 0.33 (C). Other parameter values include the following: h = 2, a = 3, and ε = 0.01.
