Individual probability of success across time in the High Difficulty condition. As in the Low Difficulty condition, the performance of social learners (blue triangles, n = 56) increased much faster than that one of individual learners (red diamonds, n = 40) before dropping after individuals’ isolation (vertical dashed line). However, in that condition, the probability of success and the probability of reporting the rule was higher in social learners than in individual learners. The performance of social learners plateaued because 6 out of 14 groups never inferred the rule in that treatment (see Supplementary Figure 3). Horizontal dashes show mean posterior probabilities and 95% HPDIs.