Asians = Higher Voices?

My friends tell me I talk with a voice about an octave higher than usual whenever I talk on the phone to my mom in Korean. I've noticed it occasionally and tried to bring it back to normal decibel levels, but a lot of the time I just forget and my voice travels to new heights.

It's a common phenomenon with a lot of Asian people, apparently. I talked about it with some other people. It seems as though the Asian languages are just high-toned. But at the same time, I think it's also done to fit a sort of "Asian role." It's "common knowledge" that Asian's have high voices. Asians are supposed to be small and short and talk to their elders as people looking up to age-wisened betters rather than elders. So Asian kids talk to their Asian parents as if they are Asian babies. <----------------that was all just a theory.

but it's interesting that so many people unknowingly change their voices to suit particular languages and cultures. Is it because the language is just easier to speak at a particular range? Is it because they play particular roles in particular cultures? I think it's the latter from my own personal experience, and hopefully I find out more about it in the future.