one thing is troubling to me is when high profile athletes get concussed. it's the fact that when they return, their level of play is nowhere near where it was before they were concussed.

justin morneau, MLB. eric lindros, NHL. paul kariya NHL (he played well even after 2 concussions, but after his first never scored 50 goals again). adam deadmarsh NHL. after mike tyson was knocked out in 1990, he was never the same.

thats why this year and the following, i'll be watching sidney crosby's stats to see if he experiences a dip in production.