Abstract
The mechanical impedance of the human and monkey head was determined over the frequency range 30-5000 Hz. Miniature accelerometers and pressure transducers were placed in the brain to measure its response to vibration at constant g levels and variable frequency. The maximum acceleration studied was 20 g's. In vitro experiments on a fresh human cadaver and in vivo and in vitro experiments on monkeys were performed. The effect of varying blood pressure was investigated as well as the contribution to the mechanical impedance of the scalp, skull and brain.