I'm not entirely sure how normal this is, but since I was a child, I've been able to produce myself voluntarily a "chill" sensation that seems to start on my head and traverse the rest of my body, being least intense in the feet. Looking around the internet and forums, looks like other people but not everybody also describe this ability. However, unlike other people's reports, I don't see "goose bumps" on my skin, at least there aren't any visibly; it's just the sensation.
Does anybody know if there are any relevant studies or knowledge out there about "voluntary goose bumps"? Is there even a proper name for that?