This is interesting. I currently have embarked upon a course of singing lessons ( I used to be a pro singer, but have found for several years now that I've been unable to control my voice, feels almost like puberty again with my voice breaking) . I now realise that my voice going was one of the earliest indications of parkinsons ( up to ten years ago, though I was only diagnosed early this year.
I have found these lessons incredibly helpful. Whilst my singing voice will probably never be what it was, the breathing exercises and posture that that have been taught have helped imeasurably with the volume and pronunciation.
i do find that when speaking I will often use totally the wrong word. For example after visiting an opticians a week or so back, I explained to my grandson that I'd been for an eye test to have some new "scissors"" prescribed. Not sure what's going on there?
I remain determined to try to sing, and also to try not to dumb down my vocabulary, since it feel that if I give in Parkinsons will have an easy victory. There also seems to be a new buzzword neuroplasticity......if you continue to try to trigger these actions, hobbies, talents etc... The brain may find other pathways to overcome its difficulties!