Fig. 13.

Schematic for the visualization of spatial and nonspatial information encoded by a single network activity vector. In this schematic 36 place cells represent a 25 × 5-cm² region. A: for the megamap arrangement, each place cell is placed at each of its place field centers, as illustrated in Fig. 1C. The location of each cell in the megamap is indicated by the cell number, and cells 1–4 are additionally indicated by color. Cell 2 does not appear on the megamap because it has no place fields in the region. Pos., position. B: for the cell arrangement, each place cell is placed at a single preset pixel, regardless of its place fields. The 2 arrangements give 2 different ways to visualize the same network activity pattern. Unless the nonspatial activity patterns are orthogonal, this dual interpretation of the network activity requires place cells to have multiple, irregularly spaced place fields.