From the phrasing of your question, I thought you were asking a different question. If you'd said "listening to", I'd have assumed your actual question, but sin

From the phrasing of your question, I thought you were asking a different question. If you'd said "listening to", I'd have assumed your actual question, but since you said "hearing" instead I took that as an intentional effort to imply a different question. One of "While you're coding, what is the auditory portion of your brain processing?" Are you hearing yourself think? Do you hear the sound of your typing? The people around you talking? Or do are you concentrating so deeply that you block those out?