Maybe tiny shocks like with a tens system, or a pinch, used to jolt your nerves into recognizing the location? I had a lot of trouble with my eyebrow arching, b

Maybe tiny shocks like with a tens system, or a pinch, used to jolt your nerves into recognizing the location? I had a lot of trouble with my eyebrow arching, but eventually got it by poking it with a straw or pushing it around with my finger. Or maybe there's a genetic component, like tongue rolling. The nerves and muscles are there, no sensation seems to be lost, they're just arranged a bit different. Kinda cool how something trivial can go into these weird rabbit holes, anyway.