Fig. 1
From: Vocal usage learning and vocal comprehension learning in harbor seals
The learning curves of seal E (above) and seal J (below) show that their performance reached the learning criterion (dashed horizontal line) in every experiment. The y-axis depicts the correct choices in % in each session. The solid horizontal line represents the chance level, i.e., the expected performance when randomly guessing. The dotted learning curve in Experiment 2 depicts the correct responses to only the novel stimuli. The stars (****) indicate a p-value of < 0.0001 of reaching the learning criterion within the observed number of sessions. For a learning curve of the training phase, see Figure S1