Good morning, Just read your response "my husband can smile when he wants to" and must add two cents from the PWP here. You are right, the masking is a part of Parkinson's. You error in " can smile when he wants to". I recall the first time I saw a video of myself walking. I had always assumed that if I held my head up and smiled while I was struggling, no one would notice that I walked a little different.......... Video showed not only a problem with gait........but I WAS NOT holding my head up and smiling.........this came as quite a surprise to me! My husband will frequently comment re: my expression as being a bit sullen.......when I thought I was smiling. Smiles come from deep inside.......for some of us, they don't always show on the surface. Rita Weeks