Figure 4. The relationship between mean startle order (SO_Exp-M) and fish positional tendencies within the school.

The mean startle order depended on the positional tendencies of each individual fish at the time of stimulation. The X- and Z-axes correspond to the % of events in which each individual was in the front and at the edge of the school, respectively. Fish in the frontal and central positions react earlier than fish in the back and at the edge of the school. SO_Exp-M = 4.78+0.036 Ep_Exp − 0.029 Fp_Exp; p<0.001, R² = 0.38; N = 70.