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. 2007 Dec 14;3(12):e234. doi: 10.1371/journal.pcbi.0030234

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© 2007 Katz et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) First column: when the rat enters position 1, PPC1 receives an external input. w factors are decreased (see text) so that the input propagates forward to PPC3, but the response in PPC4 is below spike threshold. Second column: when the rat enters position 2, all w factors are reset. PPCs 1 and 2 receive external inputs that elicit spiking in PPCs 3 and 4, but not PPC5. When the rat enters positions 3 and 4, external inputs are delivered and w factors are adjusted in a similar manner (remaining columns).

(B) Time series plots for the primary place cells representing positions 1, 2, 3, and 4 on the maze. For each cell, the bottom trace is the input current and the top trace is the voltage response. PPCx gets external input at positions x, x + 1, and x + 2, and forward association input from positions x − 1 and x − 2. Therefore, a PPC spikes at most in five positions.