Why we talk to cats in high pitch

I came to a realization today as I was talking to our cat while petting it. For all of you that has ever had an encounter with a cat and talked to it, or even have or have had a cat of your own, you know, we human beings have a tendency to talk to cats in a high pitch tone of voice. And they like it and listen to it. It just struck me today that cats talk - or meow if you so wish - in a high pitch tone, so that's why they listen more when we use a high pitch tone. Has this ever been scientifically proven? I don't know, but who knows, some day it may :-)