YouTube Videos Yield Clues To Brain Injury Symptom: 'Fencing Response' In Knockout Hits

Researchers analyzing YouTube "knockout" videos discovered that moderate-to-severe brain stem trauma stimulates a characteristic, involuntary rigid-forearm posture, dubbed the fencing response. This response was duplicated in animal models under experimental conditions. The presence of a visible, objective symptom of brain injury could be of use to athletic trainers and coaches in making return-to-play decisions after an athlete suffers an impact to the head.

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