Generative AI chatbots capable of writing emails and computer code, translating, organising a trip or coming up with gift ideas are now readily available – prompting some to ask whether human brainpower could suffer for lack of use. A simple natural-language prompt is usually enough to draw a usable response from a service like ChatGPT or Claude, with the effects making themselves felt in schools and universities, workplaces from offices to courtrooms and our personal lives. Recent scientific...