I don't know when it happened, but I recently realized that my right hand no longer moves on its own, that it is completely dependent on my right arm if it wants to go anywhere AT ALL. As for the digits, my thumb moves just a little bit, as do the middle and ring fingers, but my index and pinky fingers are completely still. Likewise, my right wrist is kaput.
Here is a ghastly video to illustrate:
6 hours ago