Figure 1. Comparison of full trajectory metrics for two groups of animals over a set of 12 trials.

White (black) boxes: control (stress) group. Boxes represent the first, second (median, shown as a band) and third quartiles; whiskers are the minimum and maximum values. Outliers are marked as a cross. The p-values of a Friedman non-parametric test comparing both groups of animals over the full set of trials is shown in each plot (see Methods for a discussion and interpretation of the Friedman test and the p-values). (A) Escape latency shows a wide dispersion of values until later trials. (B) Average movement speed shows that stressed animals move substantially faster than non-stressed ones. (C) Average path length. Stressed animals tend to sweep longer paths than control animals; the difference between the two groups is however less distinctive than when comparing the movement speeds.