It is almost certainly the internal monologue. I can read in two ways. One in which I have the words in my head as I read them and the other in which I just 'c

It is almost certainly the internal monologue. I can read in two ways. One in which I have the words in my head as I read them and the other in which I just 'comprehend' entire sections of sentences at once. In the second there is never an internal monologue just comprehension. The second method lets me read most books in an evening, not sure what that works out in wpm but I was always significantly faster than anyone else at school at reading.