Topographic network with local connectivity on a torus.

<p><b>A, B</b>: Positions (<i>u</i>, <i>v</i>) of 10,000 cells on a torus (left and right, top and bottom edges are identified), excitatory cells shown as gray triangles, inhibitory cells as black stars, driver cells in red. <b>A</b>: Uniformly distributed excitatory and inhibitory cells. <b>B</b>: Inhibitory cells grid-aligned, excitatory cells uniformly distributed. <b>C</b>: Local connectivity profiles of excitatory and inhibitory cells.