Influence of interaction of synaptic gains on dynamic behaviors of the model, showing H_g with respect to H_s for C₃ = 10 (a) and C₃ = 30 (c). [(b), (d)] frequency distribution diagrams, [(e) and (f)] curves frequency with respect to H_s (setting H_g = 1) and H_g (setting H_s = 0.5) for C₃ = 10 (e) and C₃ = 30 (f). Other parameters remain default values as listed in Table 1. (g) Effect factor K of the parameters H_s and H_g on the generation of limit cycle oscillation. The black line in the codimension-two bifurcation diagram is the curve of the limit point bifurcation of cycles, corresponding to the LPC point in codimension-one bifurcation diagram.