Well that's usually in scenes where characters are focusing on something they see(SPOILER/OBSCENE: for example, in tha scene where Aang appears to be "taking a dump" and everyone's reacting but her because she can't visualize it or really tell that this is what it looks like)and she doesn't but if you look close enough and it is explained how she can detect what direction people are in and who that person is without hearing them speak so this isn't too far from an accurate portrayal of such a theme!
if i had the money i would send you my info and pay you to make me a wig like yours for the toph cosplay i wanna do sadly im broke u make an amazing toph
Try crossing your eyes slightly to prevent your eyes from reflexively tracking stuff.
u make an amazing toph