Fig. 2.

Numerical (left) and PSpice simulation (right) of: Time series a, b and two dimensional views c, d of the attractor projected, illustrating the complexity of the system for $I_{\text{ext}}=3,\alpha =0.1,f=1,\beta =0.02,k_2=0.5,k_1=1$ with the initial condition $\left(-1.1,-0.06,0.04,-0.08\right)$