Brian Roberts' decision not to attend next weekend's FanFest because the event could have an adverse effect on his slow recovery from a concussion has again made the Orioles second baseman a target of criticism. But, according to Roberts' agent, the 34-year-old is simply following doctor's orders -- that bright lights and noisy atmospheres can be counterproductive to someone dealing with concussion symptoms. "He has taken the advice of his doctor, and you can't blame him for it," said Mark Pieper, Roberts' agent.