Not sure why I was down-voted, from what you've said and from personal experience (working on support systems for patients of strokes), it seems as though there

Not sure why I was down-voted, from what you've said and from personal experience (working on support systems for patients of strokes), it seems as though there's reason to believe cause and effect. Unless brain damage was done, it's quite likely you can train yourself out of this habit by the way. One method I heard that works is to wear an elastic band, whenever you do it twang yourself on the wrist.