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

Figure 3

Roofs of function 𝐿 ((a) and (c)) and eigenvalue real parts with 𝜏₁ varying ((b) and (d)) for the different coupling weights (a)-(b) 𝑐=0.5 and (c)-(d) 𝑐=0.8. The other parameters are chosen as 𝑎=0.33, 𝑏=1, 𝛾=0.47, and 𝜏₂=0.

(a)

(b)

(c)

(d)