Development of OPM and retinotopic distortions in EN simulations with fixed stimulus sets of different sizes. (a) OPMs (left), their power spectra (middle) and RMs (right) for t = 10τ (upper row) and t = 300τ (lower row) obtained in simulations with fixed stimulus set (η = 0.028, σ/Λ = 0.3, s4 = 4/3, 216 stimuli). (b) 105 stimuli (all other parameters as in a). (c) 106 stimuli (all other parameters as in a). Large stripe-like OP domains are generated via pairwise pinwheel annihilation for large simulation times. Retinotopic distortions are fairly weak.(d) Pinwheel density time course for EN simulations with fixed stimulus sets of different sizes, including the simulations from a to c (red, green, blue traces 216, 105, 106 stimuli) (all other parameters as in a). Dashed lines represent individual simulations, solid lines an average over four simulations. Note, that the pinwheel density rapidly decays below 2.0 in both cases, and in particular for 106 stimuli, the OPM pattern acquires large stripe-like regions.