https://theconversation.com/writing-builds-resilience-by-changing-your-brain-helping-you-face-everyday-challenges-265188

That means all the children including the better off ones.

https://www.theguardian.com/science/2025/sep/30/study-links-greater-inequality-to-structural-changes-in-childrens-brains?CMP=Share_AndroidApp_Other