Figure 6

(a,b) Stimuli used in Experiment 4a and 4b respectively. (c) In Experiment 4a, snails showed a significant preference for the stimulus with vertical bars (P = 0.004). (d) In Experiment 4b, snails showed a significant preference for the stimulus with larger numerosity (P = 0.011). Dotted line represents the expected preference by chance, and asterisks indicate significant deviations from the chance level (P < 0.05).