Figure 1From: Multiple bifurcations and periodic coexistence in a delayed Hopfield two-neural system with a monotonic activation functionSystem nullclines illustrate the equilibrium numbers with (a) \(\gamma = 0.1\), (b) \(\gamma = 0.5\), (c) \(\gamma = 1.6\), and (d) \(\gamma = 2.0\) for the given parameter values \(a _{12}= 1\), \(a _{21}= 0.6\)Back to article page