Vikings wide receiver Percy Harvin believes that his issues with migraine headaches should be behind him. "I did a test (Friday) night," Harvin said. "They found some things that we think is the main cause of it. We're all feeling really confident. I know we said that a couple times, but I think this time we found what the main cause was. I'm not saying I won't ever get a headache again, but hopefully, we can slow it down a little bit." Harvin hadn't done much of anything on the field since his Aug. 19 collapse. He caught a pass for a 34-yard gain in Minnesota's preseason game against Seattle on Saturday night. "It was tough, but that's part of life," Harvin said. "We've got a great plan coming up here, so I think everything should be behind me."