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Fig. 4. (A–D) Choice frequencies of six fishes in transfer tests, during
which the S+ used during training was replaced by a novel object. Each bar
depicts the choice frequency for the left object (novel object or S+) of each
pair. Below each bar, the object replacing S+ is named. `Ratio' is the volume
ratio of the two objects offered, with the volume of the right object
(S–) divided by the volume of the left object (novel object, except for
training conditions, far right columns). Other details as in
Fig. 3.