Fig. 2.

Acquisition of the rat gambling task (rGT) in optimal and suboptimal groups of rats during the training phase. In (a) and (b), rats in the optimal group (n=15) showed a different learning acquisition curve for the four choice options compared with the suboptimal group (n=9) during the 30 sessions (of 30 min) corresponding to the training phase. In (c), the optimal group of rats showed a significantly greater preference for optimal choices (P₁+P₂) compared with the suboptimal group of animals. ***P<0.001, Student’s t-test.