Fig. 6: Example of single units’ activity as a function of landmark appearance.

a, b Raster plot (top) and average activity (bottom, in red) of two example PPC cells showing a significant response when aligned on landmark appearances, for any positions in the maze. The standard errors are indicated in light color. The lines above indicate times for which activity was significantly higher than baseline ((a) from 47 to 319 ms; (b) from −137 to 39 ms and from 147 to 208 ms). c, d Same as (a, b) for two hippocampus example cells. The activity was significantly higher than baseline from 74 to 293 ms relative to appearance for (c) and from −229 to 61 ms for (d).