Figure 1.

The double-plotted actograms of the total activity of six group-housed male mice (a), of the activity of the highest ranking of those six mice while group housed (b), the activity of that same mouse while singly housed (c) and the total activity of six male mice while singly housed (d). White background denotes light; grey background denotes darkness and black bars denote activity (as measured by passing through the gate between the two compartments. Note that for each animal, daytime activity is reduced under single housing conditions when compared with group housing, as is shown in figure 2b (see electronic supplementary material, figure S3 for the individual data underlying figure 2a,b). Activity is also displayed as the total relative activity over the course of the 24 h period, relative to the maximum activity. Activity has been pooled in 1 min bins over the course of the group housing phase for all individuals (e), for the highest ranking animal (f), in the single housing phase for the highest ranking animal (g) and in the single housing phase for all individual mice (h).