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Mean knot-tying skills over 10 generations for the one-model and five-model treatments in Experiment 2. Scores rescaled to between 0 and 100, where 100 is a perfect score. The loss of skills is fastest in the first three generations and much faster in the one-model treatment than in the five-model treatment. Generations 4–10 suggest different equilibria where the five-model treatment has an equilibrium at twice the skill level of the one-model equilibrium.
