This is an updated version of an earlier post.
The discovery was made by researchers at Boston University, which is one of the institutions studying the brains of former players with the relationship between concussions and CTE still not completely understood. Symptoms can include depression, mood swings, difficulty concentrating and even dementia. Presently the disease can only be determined definitively at autopsy and former players, like Stabler, are increasingly stipulating that their brains be donated for post-mortem study.
“He had moderately severe disease,” Dr. Ann McKee, the chief of neuropathology at the V.A. Boston Healthcare System and a professor of neurology and pathology at Boston University School of Medicine, told the Times. She conducted the examination of Stabler’s brain and found him to have Stage 3 CTE on a 1 to 4 scale, with 4 being the most severe. “Pretty classic. It may be surprising since he was a quarterback, but certainly the lesions were widespread, and they were quite severe, affecting many regions of the brain.”
Lesions on Stabler's brain: "they were quite severe, affecting many regions of the brain.” https://t.co/qze8s3Z0J4 pic.twitter.com/cBZyun7Gl7— NYT Sports (@NYTSports) February 3, 2016
Stage 3 symptoms are marked by visuospatial difficulties, more extensive cognitive and memory problems, and apathy. In fact, researchers say that, at this stage, 75 percent of people are cognitively impaired.
The discovery is somewhat unusual in quarterbacks, but Stabler was known for frequently scrambling and took more hits than players at the position typically did. He has been considered three times for the Pro Football Hall of Fame and his name is up for consideration again Saturday when members of the Pro Football Writers of America vote Saturday at Super Bowl 50.
Last week, CTE was found in the brain of 27-year-old Tyler Sash, the former New York Giants player who died of an accidental prescription drug overdose in September.