the person would most likely die,or atleast go into a vegitable state. the hindbrain contains the reflex parts of the nervous system. this includes the involuntary muscles which include the cardiac muscles (heart) and the diegestive tract muscles. meaning the heart would beat out of controll or just not at all because it is receving no stimuli to beat from the hindbrain. the spinal cord controls alot of reflexes also so if the hindbrain isint damaged too badly the person would just probobaly go into a vegitable state. but hindbrain damage would be much more serious than frontal or midbrain damage.