What do you think about when you see a piece of music? Are you seeing or hearing chords, individual notes? Are you focusing on your hand position or relaxing to make it easier? Are you focusing on keeping up with the metronome if the tempo is beyond your capabilities? etc etc etc...What do you focus on while playing?And, what should you focus on? If you've drilled the notes into your hands so you can play without any attention, should you still be thinking about individual notes and chords (on that level)?