A study to be presented at a meeting of the American Academy of Neurology attempts to do exactly that, comparing 10 of the most widely used football helmets in drop tests designed to measure the kinds of forces that are most likely to result in concussion.

The latest research finds that football helmets, which have been designed largely to prevent skull fractures and brain contusions, aren’t all that effective against concussion, which happens when the brain bounces and twists around inside the skull.

via Los Angeles Times