Ann,

There are a number of possible explanations:

1. There is a bug in my program. Were the results correct?
2. There is a natural variability in performance. A typical score for me is 10, so a change of 5 is unlikely to be "natural", but if you have high scores that is possible.
3. Does your medication improve your arm movements? My meds make a big difference to my arms, but almost no difference to my legs.
4. Was your state improved by the meds? How did you feel on the second time compared with the first? Some PwP report feeling good first thing in the morning.
5. Did you follow the same protocol both times? Only the index finger of one hand.

John