Former Seattle Seahawks quarterback Matt Hasselbeck is putting his own brain under the microscope in an effort to help researchers solve one of football’s most toughest medical questions. Hasselbeck spent 10 seasons with the Seattle Seahawks, led the franchise to its first Super Bowl appearance and was inducted into the team’s Ring of Honor in 2021. Hasselbeck Says Former Seahawks Teammates Motivated CTE DecisionHasselbeck told ESPN/AP that he entered the study feeling healthy, but his playing history still made him a valuable participant. Hasselbeck’s Seahawks Legacy Gives His Role in Study Added MeaningFew former players are as closely tied to Seattle’s rise in the 2000s as Hasselbeck. By the time his Seattle tenure ended, Hasselbeck held the franchise records for passing attempts, completions, yards and career wins.