After almost two years, our paper "The shrinking landscape of linguistic diversity in the age of large language models" is out in Nature Human Behaviour, and it made the cover! | Morteza Dehghani
After almost two years, our paper "The shrinking landscape of linguistic diversity in the age of large language models" is out in Nature Human Behaviour, and it made the cover!
Three studies, seven datasets, 880,000+ texts. The short version: when an LLM polishes your writing, the content survives but you don't.
What we found:
- After ChatGPT's release, the variance in writing complexity dropped across Reddit, arXiv, and Patch News. Writing converged toward a common style.
- LLM rewriting cuts writing-complexity variance by 21–50% across datasets and models.
- Classifiers that recover an author's age, gender, personality, empathy, moral values, and political affiliation from their original text stop working after a rewrite. The signal doesn't just weaken. It shifts toward dominant categories.
- For psychology and the behavioral sciences: a century of work treats language as a window into the person. That window is closing. Text-based measurement (clinical screening, personality assessment, corpus studies of culture and morality) assumes the writing carries individual signal. As LLM-assisted text fills our datasets, that assumption needs checking, not inheriting.-
- For AI: homogenization isn't a style complaint. Models that flatten their inputs degrade the personalization built on top of them, feed narrower text back into the next round of training, and quietly push writers toward dominant categories they didn't choose. Preserving variation should be a design target, not a side effect.
Paper: https://lnkd.in/gDGU55vZ Research Briefing: https://lnkd.in/ge2Ka4ka Our earlier theoretical piece in Trends in Cognitive Sciences: https://lnkd.in/gQtPFtf4
Congratulations to Zhivar Sourati, who led this, and to Farzan Karimi-Malekabadi, Meltem Ozcan, Colin McDaniel, Alireza Ziabari, Jackson Trager, Ala N. Tak, Meng Chen, and Fred Morstatter.
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