the severity of each one plays a big part on it. Some seem to knock guys out for weeks, and some guys are back in practice a few days later.
That being said, I dislike Ben Roethlisberger more than any other pro athlete, but I still hope this doesn’t have any long term effects on him.

I hope that doesn’t happen, because he is a special player.

What kind of medical backing do these post-concussion tests team uses have? Are they sound or are akin to, hey, his fingers are moving, so his arm’s not broken!

It’s like a boxer, over time they develop a slur to their speech and even stutters. I have a close friend who use to box and he says that he isn’t punchy but everyone else can tell. Sad really.

Concussions can cause similar effects depending on the severity.