Information Please: 1. I read that Parkinson's Disease is "the fourth most common neurological disease of the elderly". Can anyone tell me what the first three are? 2. "Hyperexcitable reflex blinks are a cardinal sign of Parkinson's disease." I never heard of that before! Reflex blinks have nothing to do with the low blink rate frequently mentioned in books about PD. Instead they are reaction to a threatened blow, first identified as "reflex" by the philosopher Descartes. How can "hyperexcitability" be observed, and why isn't it a standard part of the neurologist's diagnostic repertoire? To all who may be disappointed by My fallibility, My apologies. To anyone who can furnish answers to these questions, My thanks. Cheers, Joe J. R. Bruman (818) 789-3694 I3527 Cody Road Sherman Oaks CA 91403 A hyperexcitability of all relexes is a diagnostic sign for cerebral damage. I was totally convinced that I had a real disease in cerebro (this is Latin to show those English anti-EEG people on their island that on the European continent Latin is teached too, sed nunc non est his locus.)when my kneereflex gave two responses after only one pat. Absent reflexes show damage in the spine exists Ida Kamphuis, Holland