May P R, Fuster J M, Haber J, Hirschman A
Arch Neurol. 1979 Jun;36(6):370-3. doi: 10.1001/archneur.1979.00500420080011.
High-speed cinematograph films of a drilling woodpecker were examined by direct visual inspection and by a microdensitometer and computer-imaging technique. These showed (1) that the drilling trajectory is essentially linear, with very little, if any, rotation of the head; (2) that there is minimal movement after impact; (3) that the impact velocity is of the order of 600 to 700 cm/s; and (4) that the impact deceleration is of the order of 1,000 g. Dynamic and morphologic findings in the woodpecker may be highly relevant to the prevention of concussion and brain injury in man. Taken in the context of modern packaging technology and other animal and mathematical modelling research, they suggest that brain injury preventive systems could be greatly improved over those now in common use.
通过直接目视检查以及微密度计和计算机成像技术，对啄木鸟啄木的高速电影胶片进行了研究。这些研究表明：（1）啄木轨迹基本呈线性，头部即使有旋转也非常小；（2）撞击后运动极小；（3）撞击速度约为600至700厘米/秒；（4）撞击减速度约为1000g。啄木鸟的动力学和形态学发现可能与预防人类脑震荡和脑损伤高度相关。结合现代包装技术以及其他动物和数学建模研究来看，这些发现表明，与目前常用的预防系统相比，脑损伤预防系统可以得到极大改进。
