> cannot see in his mind, cannot speak in his mind, and that he didn't realize this was odd until adulthood There are countless anecdotes of exactly this scena

> cannot see in his mind, cannot speak in his mind, and that he didn't realize this was odd until adulthood There are countless anecdotes of exactly this scenario across the internet. It's trivial to find people sharing their experiences of growing up without internal monologues, mind's eye, etc, and not realizing that they're different. E.g. they may have thought visualization was a figure of speech. You can find examples in this very thread.