The Claim
AI-generated text contains significantly higher proportions of nouns, coordinating conjunctions, adjectival modifiers, conjuncts, and difficult content words than human-written essays, while human-written essays contain higher proportions of pronouns, auxiliaries, adpositions, prepositional modifiers, and function words, resulting in AI text being more formal, dense, and structurally uniform and human text being more referentially rich and syntactically varied.
What the research says
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AI-generated writing uses more complex nouns and connecting words than human writing, while human writing uses more pronouns and simple grammatical elements, making AI text more formal and uniform and human text more varied and reference-rich.
See the scientific wording
AI-generated text exhibits significantly higher proportions of nouns, coordinating conjunctions, adjectival modifiers, conjuncts, and difficult content words compared to human-written essays, while human text uses more pronouns, auxiliaries, adpositions, prepositional modifiers, and function words, indicating that AI text tends toward formal, dense, and structurally uniform phrasing whereas human writing is more referentially rich and syntactically varied.
AI systems generate text by statistically predicting the next word based on massive datasets of formal writing, leading to dense, noun-heavy phrasing with fewer personal references. Human writing naturally includes more pronouns and simple connectors because it arises from real-time social interaction and embodied experience.
What the research says
1 studyAI-written essays use fancier, longer words and more nouns, while human essays use more words like 'we' and 'they' to sound natural and conversational. The study found exactly this pattern.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
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