Fig. 4. Representative examples of the ventilatory (A) and cardiac (B) reactions to startling stimuli. The stimulus was presented at time 0. Vertical lines delineate resting behaviours and reaction stages 1–3. Broken lines delimit the maximum and minimum rates before the stimulus. Circles emphasize maximum and minimum rates after the stimulus. (A) Cuttlefish #12: decrease in ventilation rate: 78.9% (Video 2 in supplementary material). (B) Cuttlefish #22: decrease in heart rate: 28.3%.