Color-coded firing rate maps of 4 example cells recorded in CA1 (experimental protocol as in Figure 1A). The red square indicates the object. The first cell changes its spatial firing pattern only upon introduction of the object (top row). The second cell changes its spatial firing pattern when the object is introduced but it preserves the firing pattern during the next trials, leaving a trace of the original firing field (second row). The third cell changes its firing pattern when the object is moved and maintains a trace on the last trial (third row). The fourth cell changes its firing pattern when the object is moved, but the spatial firing pattern is more diffuse than in the other cells (last row). Rat ID and cell ID are indicated to the left of the firing rate maps, and peak firing rate in each trial is indicated at the top of each rate map. Bars, color-coded firing rate.
