I self-taught myself to read at age 4. I was clearly hyperlexic. I couldn't even sound out words or understand basic phonics. I simply memorized a word by its sound and appearance after the first encounter. I couldn't spell until third grade. I'd mix the middle letters up, because, again, I didn't grasp phonics. Nobody ever had me tested as a kid, so I have no clue what grade level I read at. All I know is that I baffled teachers and family by being in preschool and being able to read such words as "secretary," "guilty," and "pediatrics." I read to all the kids in kindergarten. Whenever I'd finish my work early (which was often), I was allowed to go read. Then, as others finished, I could read aloud to them.
Words and grammar have been my lifelong friends. I'm hyperlexic in foreign languages, too, I believe. I self-taught myself advanced Spanish. I have an extremely advanced Spanish vocabulary and conception of grammar. However, my ability to converse in Spanish is just average. Same with overall comprehension. I care much more about recognizing obscure vocab words than I do about the meaning of a story.
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Helinger: Now, what do you see, John?
Nash: Recognition...
Helinger: Well, try seeing accomplishment!
Nash: Is there a difference?