A cluster of new studies, conference papers, and high‑profile news stories has pushed the once‑abstract question—“Is ChatGPT changing how your brain works?”—into the center of public debate, and the early answer from the scientific literature is both urgent and nuanced: habitual reliance on large language models (LLMs) appears to reshape how people approach memory, problem solving, and language, but the magnitude, permanence, and population‑level consequences of those changes remain...