Signs of Sir Terry Pratchett's dementia may have been hidden in his books‎

Signs of Sir Terry Pratchett's dementia may have been present in his writing a decade before his official diagnosis, new research has found. Researchers have examined the lexical diversity—a measure of how varied an author's word choices are—of 33 books from Pratchett's Discworld series, focusing specifically on his use of nouns and adjectives.