Is there a word for "body language accent" and is there a body of literature on this subject that I could find if I had the right keywords?

I mean things like styles of sitting attributed regionality ("asian squat", "western toilet"), levels of physicality in speech ("gag an italian by handcuffing them"), also things like the way a lot of white American men will have been trained to pitch a ball with a certain posture that reminds you of specifically baseball, or how nearly everyone who went through the Finnish school system has a certain angle to the way they sit. This way of holding oneself and expressing oneself which seems like actually the deepest level of cultural identification for many.

@compost_funeral Is the Asian squat different from the Slav squat?
@woe2you @compost_funeral i reckon yes. asian squat is when entire foot is flat on the ground. in slavic squat heels often donโ€™t touch the ground. source: iโ€™m from almaty, where both squats are common
@woe2you to my understanding both "asian squat" and "slav squat" refer to heels fully on the ground, it is also sometimes called the "developing world squat" or even "toddler squat" because the common factor is that humans pretty much all sit like this if they haven't been trained out of it by chairs always being available.