An analysis of Terry Pratchett's novels finds that a decrease in lexical diversity--a characteristic of dementia--first appeared ten years before his diagnosis of posterior cortical atrophy.

Summary: https://theconversation.com/terry-pratchetts-novels-may-have-held-clues-to-his-dementia-a-decade-before-diagnosis-our-new-study-suggests-273777

Original paper: https://www.mdpi.com/2076-3425/16/1/94

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