"Guys are more open to reporting them, and they know more about the effects and how dangerous they can be in the long term," Miller said in 2010. "Guys are making smarter decisions."
Miller had suffered two concussions in 2009, so the issue was personal for him. Miller has subsequently suffered two more concussions, both with Seattle. The latest, suffered Saturday night in the Seahawks' season opener, made it four concussions in 34 months for the 26-year-old Miller. This one was not believed to be severe, but with repeated concussions carrying long-term implications for some, Miller's history raises concerns.