Mechanism of sound susceptibility in organ of Corti - inference of contrary recruitment phenomenon (hypothesis) and the application to diagnosis -.

In order to make the mechanism concerned with the sound-susceptibility in the organ of Corti clear, we observed the organ of Corti with the phase-contrast microscope, after the microdissection of the cochleae in human, dogs, guinea pigs and hamsters by Engstroöm's surface preparation technique. As a result, we have formulated a hypothesis for the mechanism of the sound-susceptibility in the organ of Corti. Further, we have inferred the contrary recruitment phenomenon (hypothesis), by explaining theoretically such a clinical fact as the recruitment phenomenon or the cochlear hearing loss by applying our first formula of hypothesis. Finally, we described the application of the contrary recruitment phenomenon (hypothesis) to the early discovery or diagnosis of the false normal ear or cochlea, in other words, latent hearing loss.