U.S. researchers looked at the case histories of 36 deceased adult men who had chronic traumatic encephalopathy and found 22 of them initially exhibited mood or behavioral changes, while 11 first exhibited cognitive impairment. Currently, CTE can be diagnosed only postmortem, and the study, published in the journal Neurology, "is our first look at what the disease might look like in individuals who are still alive," researcher Robert A. Stern said.

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