FIG. 6.

De novo place field formation. Initial weights were generated randomly (0–0.5) from input cells 100–900. The model was then run for 40 laps with CaDP learning rules. Out of a total of 20 simulations, 16 developed spatial tuning (place fields) at different locations with different shapes and peak amplitudes. Three examples are given here (A–C). In 4 cases the weight vectors eventually “died out” or disappeared after 20–30 laps and an example is given here (D). The conventions are the same as in Figs. 2A and 4A.