What Happens When I Read

When I read I can see pictures and hear the voices of some characters in my mind. Different book have different voices in my mind, for example comic and NON-FICTION books.
There's different voices in comic books, some of the voices sounds like a boy and some of the voices sounds like a man. When I read a NON-FICTION books I can only hear one voices because most of the NON-FICTION books are third person point of view.