Fig. 2. Mean change in speed over time as a function of relative groupmate locations.

(A to F) Mean change in speed over time (the mean of $\frac{\mathrm{\Delta }\mathit{s}}{\mathrm{\Delta }\mathit{t}}(\mathit{t})$) of focal fish as a function of all other groupmate relative locations before (A, C, and E) and after (B, D, and F) application of cues for focal fish located at the origin, for fish subject to control (A and B), food (C and D), or alarm (E and F) treatments. The direction of motion of focal fish in each plot is parallel to the positive x axis. Extreme changes in speed have been truncated at 100 mm/s² in these plots for visualization purposes. The calculations used to generate these plots are detailed in sections S1.2 and S1.5.