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Perhaps most surprisingly, mental simulation can also build skills. A review of thirty-five studies featuring 3,214 participants showed that mental practice alone—sitting quietly, without moving, and picturing yourself performing a task successfully from start to finish—improves performance significantly. The results were borne out over a large number of tasks: Mental simulation helped people weld better and throw darts better. Trombonists improved their playing, and competitive figure skaters improved their skating. Not surprisingly, mental practice is more effective when a task involves more mental activity (e.g., trombone playing) as opposed to physical activity (e.g., balancing), but the magnitude of gains from mental practice is large on average: Overall, mental practice alone produced about two thirds of the benefits of actual physical practice.

The takeaway is simple: Mental simulation is not as good as actually doing something, but it’s the next best thing. And, to circle back to the world of sticky ideas, what we’re suggesting is that the right kind of story is, effectively, a simulation. Stories are like flight simulators for the brain. Hearing the nurse’s heart-monitor story isn’t like being there, but it’s the next best thing.