girja (and Stitcher who gave a snip of these studies earlier) - thanks for this info. It appears (and I am not surprised) that the Fox Foundation has been on top of this subtype thing. This information has probably passed by me several times (a good reason to have flashing lights and bells and whistles attached to such studies - lol).

Such studies, however, would require the input of several people with PD who are knowledgeable enough about the disease to differentiate between categorizing symptoms common to PD and those not. And as paula has said before, NeuroTalk would be a good vehiclel for providing such information.

So, what are we waiting for?
Peg

PS - meant to add that Doctors Hauser and van Hilten (Netherlands) are excellent choices for these studies.