The linearization of the EN model dynamics around the unselective fixed point. (a) Eigenvalue spectra of the linearized retinotopy dynamics for longitudinal mode (, blue trace) and transversal mode (, red trace). (b) Longitudinal mode (left) and transversal mode (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)).