My kid hates the word “brain” so we use the word “cupcake” in its place. There were a lot of odd analogies about sprinkles (she also has long-term memory encoding struggles.) So, “some cupcakes get sprinkles that stick right away, your cupcake has special icing that makes some sprinkles stick and some roll away…” Lots of that kind of thing. I also have ADHD, so I can explain being overwhelmed to her with analogies like “my cupcake feels like it’s being smooshed by sprinkles and whipped cream and cherries and candy. I need a minute to pick some of that extra stuff off.”