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I have been following with keen interest the various many comments that have been aired on internet. It is obvious that there is an extraordinary upsurge in interest in surgical treatment of PD and a mad rush for surgeons and lists of centers that are willing (and able) to do this surgery. What I have not seen is any reference to the procedure known as VIM/STIM. For the bennifit of those who may not have heard of this operation I ask forbearance for repeating what many must know. I quote from "Facts on Surgical Alternatives" printed and destributed by UPF/ITF. This is the best literature that I have seen on this subject. Despite their warning that no part on this booklet may be reproduced without their permission I reprint some of it here. For those wanting to get the full printout their address is : United Parkinson's Foundation/International Tremor Foundation 811 West Washington Boulevard Chicago, IL ??607 (illegible) William Koller MD, Ph. D. President, ITF and Chairman Department of Neurology University of Kansas Introduction :- "During the course of thalamotomies, it has long been observed that stimulus of the target namely trhe ventral intermedius nucleus of the thalamus (VIM) has the same effects as does it's destruction. Although it's mechanism is not known, the paradoxic effect is closely related to the amount of stimulus that is given and can't be induced under 100 hertz (cycles per second). Because of it's total and immediate reversibility, VIM stimulatioin has been attempted in patients presenting with the tremors of Parkinson's disease (PD) and essential tremor (ET). It was thought that, because VIM stimulation is reversible and that one can adjust the stimulation given, that is, increase stimulation for better tremor control or decrease stimulation because of it's side effects, this may represent a better approach than the traditional thalamotmy. Furthermore, bilateral procedures can be done without the risk of permanent impairment of speech". Theraafter follows a detailed explantatoin of the technique. It does seem that TREMOR is the indication for this procedure. For those who are interested I suggest that they write to the above address. Is there anyone who has any personal informatoin on this subject? There is much that recommends it to me. No permanent "lesions" are made which cannot be reversed. PLEASE - those who know about this please let us have your knowledge. If anyone wants me to elucidate further on this subject please say so and I will try. John.