Figure 3.

Density of place field peaks and the size of fields change with distance from the environmental boundary

(A) Place field peak density per unit area (field peak/m²) is lower near the wall in large environments compared with small environments (left) and decreased with distance from the wall (right). Cartoon above each plot indicates wall distances in shades of green. Pairwise post hoc tests for this and subsequent panels adjusted for multiple comparisons using Benjamini-Hochberg (non-negative) correction. ∗p = 0.05; ∗∗p = 0.01; ns, not significant.

(B) The average area of place fields increased with distance from the wall and were larger in bigger environments when the wall distance was controlled for. Variance in field area was not determined by clustering quality (Table S1).

(C) The average width of place fields measured orthogonal to the nearest wall (Figure S3B) in environment D increased with distance from the wall. The cartoon above the plot indicates the wall distances and includes locations in the environment in green bands, and the arrow indicates the axis of measurement.

(D) The average width of place fields measured parallel to the short wall was the same in all distance bins. The same observation was made in recordings from all environments (Figures S3C and S3D).