Fig. 4.

Two possible mechanisms for dynamic updating in continuous attractor networks. A, Network connectivity. Each cell (circle) sends excitatory signals (triangles) to its neighbors and inhibitory signals (bars) to all of the cells in the network (for clarity, only the connections from one prototypic cell are shown). B, Progressive updating of the ensemble response of the HD system. The firing rate of each formal cell is proportional to the height of the vertical bar. The hill of activity migrates progressively to the target population. C, Abrupt updating of the ensemble response. The hill of activity jumps to the target firing pattern without activation of intermediate neurons.