Figure 3

The linearization of the EN model dynamics around the unselective fixed point. (a) Eigenvalue spectra of the linearized retinotopy dynamics for longitudinal mode (${\lambda }_L^r\left(k\right)$, blue trace) and transversal mode (${\lambda }_T^r\left(k\right)$, red trace). (b) Longitudinal mode $~{\mathbf{k}}_{\varphi }{e}^{i{\mathbf{k}}_{\varphi }\mathbf{x}}+c.c.$ (left) and transversal mode $~{\mathbf{k}}_{\varphi +\pi ∕2}{e}^{i{\mathbf{k}}_{\varphi }\mathbf{x}}+c.c.$ (right). (c) Spectrum of eigenvalues of the linearized OPM dynamics (red trace) for σ < σ*(η). Orange region marks the unstable annulus of Fourier modes (critical circle). (d) Stability regions of the nonselective state in the EN model. The stability border is given by σ*(η) (Equation (12)).