The Change of Phase Caused by Impedance Deafness

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Abstract
Interference with the sound-conductive mechanism causes a change in phase of the electrical cochlear response. This effect does not consist in a sudden reversal of phase, but in a gradual shift. The former conception led to difficulties in understanding the course of deafness in oto-sclerosis, as pointed out by Pohlman. Considering the actual phase shift, as seen in the experimental oscillograms, we find that this paradox does not arise. Injecting oil into the middle ear causes a phase shift which is qualitatively the same as the one theoretically expected in a simple vibrating system when friction is increased. If the malleus is put under constant pressure, a phase shift results which is similar to the one caused in a simple vibrating system by increased stiffness.

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