The Claim
AI-generated text exhibits higher lexical density and greater use of difficult content words compared to human-written text, while human-written text uses a higher proportion of function words.
What the research says
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Text written by artificial intelligence uses more complex and rare words than text written by people, while human writing uses more common grammatical words like 'the', 'and', and 'is.
See the scientific wording
AI-generated text demonstrates higher lexical density and greater use of difficult content words than human-written text, while human text relies more on function words, suggesting AI prioritizes lexical sophistication and informational packing over conversational fluency and audience adaptation.
AI systems generate text by predicting the next word based on patterns learned from vast amounts of written data, favoring complex and information-dense vocabulary because those patterns are statistically common in formal writing. Human writing naturally includes more simple words that connect ideas smoothly because people adapt their language to sound conversational and relatable.
What the research says
1 studyAI writing uses fancier, longer words and packs more info into each sentence, while human writing uses simpler words like 'the' and 'they' to sound more natural and friendly. This study found exactly that when comparing AI and human essays.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
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