AI writing assistants preserve content while flattening the human signals inside language
A Nature Human Behaviour article reports three studies covering seven datasets, several domains, and more than 880,000 texts. The researchers found that large language models used to polish or rewrite writing often preserved core content while making styles more alike. Across datasets and models, variance in writing complexity fell by a statistically significant 21 to 50 percent. The rewriting also amplified patterns associated with dominant characteristics while suppressing others, shifting language toward conformity. The study links those changes to potential consequences for cultural preservation, personalization, hiring, and diagnostic processes that infer identity or psychological state from language. The result does not mean every AI-assisted sentence destroys individuality, and the observational parts should not be read as a single causal estimate of society-wide change. It shows a measurable risk that convenience standardizes the signals institutions use to understand people. Consequential settings should preserve original text, disclose substantial AI rewriting, and test whether linguistic normalization changes judgments about a person.
