Neurological test involving rubbing one's fingernails?
When I went to my new neurologist a few weeks ago, he started kind of rubbing the fingernail of my left index finger repeatedly during the neurological exam that he did. He did it a few times, laughed and said "I'm taking the paint off your nails" and then continued on with the rest of his exam. At the time, I thought he was just sort of apologizing that whatever he was doing was causing my nail polish to chip, so I laughed and said "That's okay" and didn't think much else of it. However, now I'm kind of curious what exactly was he testing for? I've watched a lot of videos of comprehensive neurological exams, and I've never seen anyone do that before. Maybe he was literally just trying to remove the nail polish from my nail so he could see the color of my nails or something? I don't know. If that were the case, he could have just asked me to chip it off...I had on several layers, so it should have peeled off with relative ease.
I'm really confused by this and just curious if anyone has any clue what he was testing for.