By means of a portable acoustic bridge, it is now possible to measure the acoustic impedance at the eardrum of fresh human cadavers. Comparison with the acoustic impedance determined by the same method and with the same instrumentation on live subjects shows that the impedance increases considerably after death. Consequently, results obtained on cadaver ears cannot be applied directly to the middle-ear function during life.
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Zwislocki et al. (1963) studied this question.