I just read about this over on theatlantic. I too thought many people could do this and never thought much about it aside from a party trick now and then.
Of course, I was that strange kid that stared in the mirror, poking my muscles around my neck and ears until I figured out which once controlled my ears, then practiced until I could move them both independently.
Anyway, if you need another subject to study, I have very powerful control over my goosebumps. It is more difficult when the temperature rises, but still usually requires only some back of the neck and ear moving muscles to start the piloerection wave across my body.
I've always been able to do this. I concentrate on the feeling of being cold. The cold tingling starts from the back of my neck and makes it's way down and out through my arms. My back sort of automatically folds, my upper body shudders very slightly and the hair on my arms rise.
I also thought it was something everyone could do.
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