Allan, More, but still not what I was looking for. The sections in this article on PSP and MSA may be relevant. However, I think it's time to point out one of my favourites again. If you buy a book on medical conditions, you will experience every symptom known to mankind within a week! A quick read of the references may convince you that it is worth a trip to your consultant to get some professional opinion. Most disturbing, in my view, is that you need to be confident that your medico will be good enough to distinguish between the many subtleties of PD related conditions. Good Luck (or better still Good Judgement) Alf http://www.parkinsons-information-exchange-network-online.com/archive/091.ht ml