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Description: When we watch movies, we consider the characters’ mental states in order to understand and predict the narrative. Recent work in fMRI uses movie-viewing paradigms to measure functional responses in brain regions recruited for such mental state reasoning (the Theory of Mind (“ToM”) network). Here, two groups of young children (n=30 3-4yo, n=26 6-7yo) viewed a short, animated movie twice, while undergoing fMRI. As children get older, ToM brain regions were recruited earlier in time during the second presentation of the movie. This "narrative anticipation" effect is specific: there was no such effect in a control network of brain regions that responds just as robustly to the movie (the “Pain Matrix”). These results suggest that ToM brain regions play a role not just in inferring, but in actively predicting, other people's thoughts and feelings, and that as children get older, their ToM brain regions are faster to make such predictions.