Fig. S2.

Error analysis confirms that fish show little social response during decelerations. (A) Comparison of the normalized error in prediction $\left|{\overrightarrow{v}}_{\text{model}}-{\overrightarrow{v}}_{\text{real}}\right|/\langle \left|{\overrightarrow{v}}_{\text{real}}\right|\rangle$ during acceleration epochs (Left) and deceleration epochs (Right) using an active model—an RF model learned separately on each kinematic state (Eq. 3) and a passive model (Eq. 1). There is no advantage in learning a separate RF model to predict active movements in the deceleration epochs. (B) Example distributions of the errors $\left|{\overrightarrow{v}}_{\text{model}}-{\overrightarrow{v}}_{\text{real}}\right|$ in prediction during acceleration epochs (Left) and deceleration epochs (Right) for the two models as in A; again, error distributions in the deceleration epochs are similar for active and passive computation in these parts.