Bill - I think there may very well prove to be a connection between Myers-Briggs types and PD, given the effect of dopamine levels, serotonin levels, etc., on mood/personality. FWIW, Dick (the PWP in our family) is an ISTJ. I'm sure many people have read of the so-called Parkinson's personality. I believe it's described as being careful, dependable, non-risk-taking, and so forth. That would describe Dick. Also FWIW, I'm an ENFP - a very different personality type indeed. I can't speak for any other PWPs or spouses except for one couple we're friends with, where the PWP spouse is also an ISTJ, and the non-PWP is an ENFP like me. Janet just posted a resource on personality which included a bit of discussion on dopamine levels and personality. Unfortunately, I've deleted the reference after meaning to save it. If anyone comes up with it, I'd be interested in seeing it again. For those of you who have read this far and are wondering what in the heck is Myers-Briggs, you can find it if you do a search under Myers-Briggs, MBTI, personality tests, personality types, etc. Margie