The only clue you have is with patients who are fully monitored. On that basis I would suspect touch is lost after hearing but only because after seeing the changes to heart rate in response to familiar voices level out I often saw an increase in heart rate to interventions requiring physical contact, e.g. wiping someone's nose or moistening their lips. It also seems different when someone is dying without a lot of drugs and is not monitored. In that case it would seem hearing and touch go around the same time because you are only aware of bigger changes to facial expression or to the patients breathing.