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Stimulation techmiques are the latest of the "invasive" procedures for treatment of Parkinson's disease. The stimulator is usually placed in the VIM region of the THALAMUS, not the pallidum. This is generally believed to have lower risk than pallidotomy (destructive lesion of the medial globus pallidus). Pallidotomy has the risk of blindness and paralysis, especially if it is performed without electrophysiologic guidance and if the procedure is performed on both sides. A good source for further information is Mahlon DeLong (Emory U in Atlanta). Also contact William Koller, Chair at U Kansas about VIM stimulation.