Fig. 2

Interface parametrization and Mexican-hat shape for synaptic kernel. A: Compact area $\mathcal{B}$ and boundary $\partial \mathcal{B}$. Two points on the boundary r, parametrized by s and $s^{\prime }$, are shown with their normal n and tangent t vectors. B: Mexican hat (20) with parameters $\beta =0.3$ and $\gamma =3$. White contours indicate values <0, black ones ≥0, for a step size of 0.005.