I've gotten at least two people (youths) to be able to raise a single eyebrow by placing their finger on their eyebrows and feeling their muscles activate as th

I've gotten at least two people (youths) to be able to raise a single eyebrow by placing their finger on their eyebrows and feeling their muscles activate as they raise and lower both eyebrows. Keeping your fingers on the eyebrow muscles, it's almost like your brain can start to "see" the two distinct muscles. It didn't take them too long (days not weeks, not hours) to be able to raise an eyebrow. There's probably a biological component to it to, I'm not saying this will work for everyone because it didn't work for my spouse.