A. Graph from Solway et al. [8], experiment 2, with colors indicating the optimal decomposition according to their analysis. The nodes labeled s and g indicate an example start node and goal node, respectively. B. Results from Solway et al. [8], experiment 2, showing that people are more likely to think of bottlenecks states first when they plan a path between states in different communities. Notation as in Fig 5B (10 participants). C. Results from our simulation demonstrating that our model also shows the same preference. Using the hierarchy identified by our model, the hierarchical planner is more likely to consider the bottleneck state first, since it is more likely to end up as the endpoint of a bridge connecting the two clusters. Error bars are s.e.m (10 simulations).