Fig. 2. Juveniles exhibit reduced learning ability compared with adults. (A) Adults and juveniles (N=280 each) were trained using two 45 min training sessions separated by 1 h. Both age groups met the criteria for learning (i.e. a significant reduction in the number of attempted openings between sessions 1 and 2; P<0.001). (B) Normalization of the data plotted in A. The adults show a larger percentage decrease in the number of attempted openings in session 2 compared with juveniles.