Figure 5From: Stability and Hopf bifurcation analysis of fractional-order complex-valued neural networks with time delays Phase portrait of the real and imaginary parts of \(\pmb{z_{1}(t)}\) , \(\pmb{z_{2}(t)}\) , \(\pmb{z_{3}(t)}\) and \(\pmb{z_{4}(t)}\) for fractional-order CVHNN with hub structure ( 50 ). \(\alpha=0.9\) and \(\gamma= 0.31 < \gamma_{0} = 0.32 \) in (a), (b), (c) and (d) and \(\gamma= 0.45 > \gamma_{0} = 0.32 \) in (e), (f).Back to article page