Bill - My husband (52/15) had Pallidal stimulation surgeries in late '95 and early '96. We were told that for reasons they couldn't explain, there were often deficits following bilateral pallidotomies (I think in speech, vision, and possibly mentation, but don't remember for sure). They didn't expect the same problems from bilateral pallidal stims. And so far, if there are any deficits from the pallidal stims, they aren't distinguishable from the normal progress of the disease. I understand that Canadian doctors have tried pallidotomy on one side with pallidal stimulation on the other, with the goal of avoiding the bilateral pallidotomy deficits. Have you asked about this possibility? Margie Swindler