I have been able to do this since I was a child. In 2012 I developed Multiple Sclerosis. I hadn't thought about it much but stumbled on The Atlantic article and tried and couldn't anymore.
Like the girl mentioned in the article, if I try, but don't, I have a very uncomfortable feeling. I wouldn't say this feeling was profound throughout the day but sometimes, during more relaxing activities, it still bugged me. So I kept trying. It was like an itch I couldn't scratch.
For totally unrelated reasons, I recently dediced to figure what was so great about meditation (turns out it's awesome) and found I could do it again while meditating; even as a beginner. I've been meditating quite a bit for the past few weeks and now, with slightly more concentration than it took before, I can do it again. Like many of the others, it starts toward the back of the head, moves forward and down in waves. Sometimes it feels like I can help it along by pulling from my abdomen.
The effort and concentration it took to do this again felt distinctly like the rehabilitative therapy I did after my first major MS episode.
Not sure if it's noteworthy, but pre-MS, when I felt I strong negative emotion my palms developed an uncomfortable tingle. This still happens but to a much lesser degree.