I don't really know that I have experienced what they are talking about in their story. My cats all purr when they are happy if I am petting or scratching them. If they want food or water (not that their bowls are ever empty) they meow at me. Mamma has a sweet meow. Buddy has a demanding meow when he wants something. Tinky and Mack just wait for Mamma and Buddy to get me to fill the bowls.