Figure 3

Proportion of correct following responses for each dolphin during the different-clothing condition. Left panel change in performance across eight-trial blocks. Right panel the proportion of correct responses of each dolphin averaged across sessions. Numbers at the bottom of each bar indicate the ratio between correct following responses/total trials. Dashed lines indicate P < 0.05 and P < 0.01 significance levels. E Eagle, Q Quick, T Tino, P Peace. Human faces are blurred for privacy (photo courtesy of Masaki Tomonaga).