When I read a fiction book I hear a general main narration voice, usually my own but it could be someone else if I know the author was American for example. Then I also hear accents for all the characters in the book, for example many of the characters in the book I'm reading atm are Scottish, and they all have Scottish accents and the women have women's voices while the men have men's.

To those who do not hear an inner voice: I'm really struggling to imagine how the information gets in, how are you actually aware of the information ?