Sparse-to-dense coding transformation between hippocampal areas CA3 and CA1.

This difference in the number of place fields was highly significant across the recorded population of CA1 and CA3 neurons (Fig. 2a , bottom; Wilcoxon rank-sum test, P = 4 × 10 –56 )—in each of the three different large-scale tunnels (see the individual bats and tunnels in Fig. 2a , top, and Extended Data Fig. 3a ).

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