Fig. 3

Propagating stationary wave front of Eq. (1) for three classes of synaptic interactions and distributed speeds and delays. The kernel functions K and W are chosen from the class (A) (panel a), (B) (panel b) and (C) (panel c). In a$r=0$, b$r=0.4$, $\rho =0.2$ and c$r=0.4$, $\rho =3.0$. Other parameters are $s=1$, $\alpha =1.0$, $\beta =0.1$, $\sigma =1.0$, $\theta =0.2$, and the speed and delay distributions are $\xi (c)=[\delta (c-c_0)+\delta (c-c_1)]/2$, $\eta (\tau )=[\delta (\tau -{\tau }_0)+\delta (\tau -{\tau }_1)]/2$ with $c_0=5.0$, $c_1=10.0$, ${\tau }_0=0.1$ and ${\tau }_1=0.2$