I'm sorry, I know I'm being dense, but I don't vocalize when I read, even quietly. Are you suggesting that reading out loud is a technique you use to pay attention better, or do you mean it metaphorically?
There was some research that suggested that reading aloud is better than silently for retention. I had never vocalized before, and I'm struggling to do it because it slows you down so much, but it indeed increases my retention.