Does your cat speak or make any sounds that resemble a human launguage? My very first cat could make a list of different sounds and each one had its specific meaning. Sometimes he talked so much like a human baby that we started calling him the talking cat :-).
Cats can produce 50 different types of vocalizations. The same mew or meow can have many variations where each of them conveys a different message.
The cat in the video below really enjoys a good rubbing. He is so elated that he has to vocalize it. Does your cat react the same way to a back or tummy rub?