Fig. 2

Learning curve with 95% confidence interval of the average game score showing the acquisition of the game. The segregations represent the 3 consecutive training days (day 1: trials 1–20; day 2: trials 21–50; day 3: trials 51–70) and the retention day 4 (trials 71–75). The confidence intervals were calculated as follows: 95%CI = mean ± t-value*SEM, where t-value = 2.228 (DF = 10) and SEM = SD/√n. The following power function approximated the mean data-points best: y = 148.37 × ^0.1847, R² = 93%. Abbreviations: CI, confidence interval; DF, degrees of freedom; SEM, standard error of the mean; SD, standard deviation; R², explained variance