World Book Day. What stories do to children's brains.

My daughter dressed as the Worst Witch this morning. Not because the costume is easy — because she has read those books eleven times and something about Mildred Hubble, who is persistently incompetent and persistently kind, is exactly the person she wants to dress as on the one day a year when you get to choose. I think about this every World Book Day: not the costume, but the eleven times.

Reading aloud to children — or reading alongside them, or talking about what they've read — activates a cluster of brain networks that silent individual reading doesn't fully engage. The language network processes the words. The social cognition network processes the characters' intentions and emotions. The narrative network builds temporal structure: what happened before, what might happen next, what caused what. And the default mode network — the one that activates during rest and self-reflection — integrates the story with the reader's own experience.

This integration is the important part. When a child reads about a character who is persistently incompetent and persistently kind, and that character becomes someone they want to dress as, the story has done moral work. Not because anyone intended it to — the Worst Witch is not a moral lesson book. Because the child's narrative system found something in it that matched something they needed to know about themselves.