http://www.rollingstone.com/music/news/michael-j-fox-parkinsons-made-me-a-better-actor-20130916

Says Fox: "That hesitation, that Parkinsonian affect, is an opportunity to just pause in a moment and collect as a character and respond to what’s happening and just gave me this kind of gravitas. It really gave me a new view of things."
Read more at http://www.hitfix.com/tv-tattle#WOP3POqVUZwHJirI.99