Fig 7. Spatial scale of the grid patterns.

Example grid patterns obtained with different adaptation kernels K (Eq 2, top row) and different input tuning curves $\mathcal{G}$ (Eq 9, left-most column). For each choice of the functions K and $\mathcal{G}$, the synaptic weights (left) and their corresponding Fourier spectra (right) at the end of the simulation are shown (t = 10⁶ s). The synaptic-weight maps have different color scales (maximal values at the bottom-left corner). The red circles indicate the spatial frequency k_max of the weight patterns. Synaptic weights were obtained by simulating the average weight dynamics in Eq 16. Note that we used a larger enclosure (L = 2 m) as compared to the one in Figs 5 and 6 (L = 1 m). See Sec Numerical simulations for further details and parameter values.