Stability Switches and Hopf Bifurcation in a Coupled FitzHugh-Nagumo Neural System with Multiple Delays

Figure 1

Intersection points of two curves given by (9), showing the number of equilibriums: (a) unique equilibrium for 𝑐=2.0, (b) three equilibriums for 𝑐=2.3, and (c) three equilibriums for 𝑐=3.0, where the system parameter values are fixed as 𝑎=0.33, 𝑏=1, and 𝛾=0.47.

(a)

(b)

(c)