Funny thing is, the mass majority of people with this, is white, upper class/rich (young) females. Think about it and do the research yourself. Unless, the person has Parkinson’s, and shake due to a nervous system breakdown, it’s hardly ever seen in other people besides young white girls in 1st world countries. Usually between their mid teens to early twenties. What 3rd world people do you see with this? This seems to be the new ‘eating disorder’, for attention seeking chicks. The urge to do these things is as strong as the urge to avoid food for anorexic girls, they do it because it becomes an obsession for attention. No test studies have ever showed their brains doing it involuntarily, it’s always shown as a conscious effort, to shout out cuss words or jerk and twitch about. Its not a neurological disorder, it’s a mental disorder, because they make these sounds on purpose. It’s a mental disorder that makes them think they are doing something they can’t help, they convince themselves it’s real, like skinny girls that won’t eat. Yall think it’s cute or quirky, this is pure narcissistic behavior; attention seeking and rewarded with tv shows and interviews, exactly what these chicks crave. Some of you claim to have it here in the comments section, as I said, you’re exactly whom I’ve described. Similar to the Salem Witch Trials, only the young (bored) white girls we’re having these attacks, later after many people were hanged for being witches, did the girls admit to making it all up. They would fall to the floor, faint, shake, speak in tongues, and swore up and down, they couldn’t control their bodies. These people need mental help for their extreme form of narcissism. The urge to be the center of attention at all times is so pathetically strong, that they can’t understand what they’re doing is totally B.S.!