Phil, I'm not sure exactly what you are talking about. However, I know when my tremors will attack because my muscles seem to vibrate inside my arm and leg before the actual tremor starts. This was happening to me before I was on any medications. My neurologist said he has heard several PWPs say the same thing. I use this sensation to sometimes gage when I take my sinemet (CR). don't forget how to laugh Marling [log in to unmask] or [log in to unmask]