Abstract
Dolphins are thought to possess high cognitive and intellectual skills. The present study investigated the early or spontaneous establishment of the stimulus equivalence in a beluga whale in order to gain insight into the cognitive process in dolphin. First, the subject participated in an object-naming task using conditional discriminations within a matching - to - sample paradigm. The beluga whale could name three objects with alphabet like letters. Next, the subject was trained in A → B and B → C matching and tested with B → A (symmetry), A → C (transitivity) and C → A (equivalence) relations in probe trials. The performance was low in both symmetry and equivalence relationships but high in transitivity relationships. This provides the first empirical evidences for a beluga whale to develop untrained relationships based on trained relationships of stimulus sets.
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