News Summary

• Experts say findings offer 'another wake-up call' about the risks of contact sports.
• At least 1 in 4 NFL players had evidence of CTE, new study suggests.
• CTE — which can only be confirmed after death — is associated with repeated head trauma.
• It can lead to debilitating symptoms ranging from severe memory loss and balance problems to major personality changes, including depression, aggression and thoughts of suicide.
• But researchers are quick to note that brain banks skew heavily toward people who experienced concerning symptoms during life and wanted their brains studied after death.