A 54-g metal (tungsten) bolt was used to deliver an impact to the dorsal aspect of the skull, resulting in a rotational acceleration of the head through the Kimwipe. Mice underwent seven repetitive less-than-mild injuries (rlmTBI, 24-inch height; W/5 mm flat) OR repetitive mild injuries (rmTBI, 36-inch height; W/5 mm flat) in 9 days.
This seems very cruel, even in the face of progress. The price that animals pay for human survival is unimaginable.