In hockey, as in most other walks of life, talking about a problem may be an important step toward solving it. Bruins forward Nathan Horton took that step last week when he spoke with great candor about the difficulties he was having feeling comfortable and returning to form after the severe concussion he suffered in the Stanley Cup finals in June. It's not too surprising that a devastating blow to the head, such as the one Horton took from Vancouver defenseman Aaron Rome, will have a lasting effect even after the external damage has healed.