Figure 2.
(A) Proportion of first-stage stay choices as a function of reward and transition type for each age group. Children showed a model-free strategy, sensitive only to previous reward, whereas adolescents and adults exhibited a mixture of strategies, taking into account both the previous reward and transition type. (B) The model-based signature of behavior (reward-by-transition interaction) was not present in children but increased significantly with age (p = .0004).