Figure 4.

Sampling of three already established place fields over the course of an 8 min long trajectory. Despite the place fields being stable from the beginning, they appear to change position and/or split up depending on the coverage of the terrain over time. For each cell three columns are shown; from left to right these are: artificial spikes along the agent's trajectory, based on the activity values produced by our network; accumulated spikes collected in a grid of rectangular bins over the environment; the smoothed bin data as it is commonly presented in experimental papers. The activity was plotted after 30 s and 1, 2, 4, and 8 min of exploration; the number in each row denotes the peak firing activity of the corresponding cell. It can be seen that even though the place fields are stable from the beginning, measurements take time to depict stale firing fields.