One of the series I like is D.M. Cornish's 'Monster Blood Tattoo,' in which he creates a whole language. Kids who are reading that are building a language in their heads. There's no real cognitive difference. I think kids are excited by language, and they're not always given credit for that.
...for reading, once begun, quickly becomes home and circle and court and family, and indeed, without narrative, I felt exiled from my own country. By the transport of books, that which is most foreign becomes one's familiar walks and avenues; while that which is most familiar is removed to delightful strangeness; and unmoving, one travels infinite causeways, immobile and thus unfettered.
Perhaps his gloom was due to his profession, that he lived among fallen empires, and in reading these languages that had not been spoken by the common man in centuries, he had all about him the ruin of language, evidence of toppled suburbs, grass growing among the mosaics, and voices that had been choked with poison, iron, age, or ash.
