Traditional differences a and cumulative cultural increase in energy intake b as a function of SLMs and task difficulty (H) for EC=5. Blue = LE, Orange = SE, and Red = OL. Solid symbols represent those cases where we find a statistically significant increase in energy intake (Wilcoxon signed rank test with continuity correction and a Bonferroni corrected α level of 0.0125 to maintain a familywise error rate of 0.05). LE and SE are inviable at H10 and are excluded. Each data point is the mean of 10 simulations, and whiskers show standard deviation. The calculation of traditional differences and cumulative cultural change is explained in the ’Simulations and analysis’ section