I wouldn't know since I've never tried it before and never will. But I see conflicting scientific studies, so I'm just curious about whether or not it does.

When you think about it, such rapid movement would overcome the absorbing abilities of cerebrospinal fluid and do some sort of structural damage over time-- It would definitely kill brain cells by tearing axons.

And yet musicians who do it don't see their abilities affected negatively.

How many concussions would these people suffer? Surely there would be substantial sub-concussive force?

I'm very bothered by the fact that people do this to themselves and due to OCD, I keep thinking of trying it myself just to know the answer, but I don't want to put myself at risk.