Concussions that occur in contact sports such as American football increase the likelihood of recurrence several-fold once they occur, and in more severe cases may lead to the development of Alzheimer's disease or Parkinson's disease. Concussion symptoms are believed to be caused by damage to axons from the shock. Camarillo's study analyzed the behavior of the brain during a collision using a finite element model, and showed that a large distortion occurs in the center of the brain. In order to confirm this result experimentally, a two-dimensional cross-sectional model of the head including cerebral spinal fluid was constructed, and a spring for simulating neck muscles was added to the model. The strain distribution was measured by digital image correlation method, and the cause of concussion is investigated. From the results of an investigation into the effect of differences in consciousness on strain distribution, the areas with large strain were larger in the order reflection, reaction, and coma. That is thought to be influenced by the difference in the operating time of the human body's response to the simulated impact, and it was shown that being aware of the impact can suppress the strain generated inside the head.
NAGAHARU et al. (Wed,) studied this question.