Figure 4.

Massed training. The glass tube containing the prey was opened to the view of the cuttlefish for a single presentation of 20 min (ten 2-min blocks). At the end of the 10th minute of training, cuttlefish (group E₃) were given the arousing stimulation (flashing light). Arrow indicates the interval in which the arousing event occurred in the experimental group. Error bars indicate SEM. Asterisk indicates significant acquisition of the task (Wilcoxon signed-ranks test, group E₃, P < 0.05, n = 7).