Fig. 2

Distributions of the distance between the centroids of pairs of bounding boxes (a) and the percentage of overlap of the surfaces of pairs of overlapping bounding boxes (b), separated for enriched and barren housing conditions. These distributions are based on n = 21 pens (12 enriched, 9 barrens), each pen containing 15 pairs of bounding boxes (for 6 individuals) at each time point (FPS = 0.5) and over 3 days. Note that panel b starts at values greater than 0% to focus on cases where bounding boxes overlap.