Abstract
Measurements of the resting and acoustically evoked potentials in the cochlea are dependent upon the nature of the potential generators and the electrical properties of the cochlear structures. We have recently determined (1) the average characteristics of the acoustically evoked cochlear potentials (AECP) inside the scala media, (2) the resistances of the cochlear structures, and (3) the effects on the AECP of variations of the magnitude of the resting potentials of the scala media. This information has been used to evaluate current theories of generation and distribution of cochlear potentials with the aid of newly developed computer models. The effect of the electrical properties of the cochlea on the longitudinal distribution and magnitude of the potentials will be illustrated. It was found that the characteristics of the cochlear microphonics and summering potentials in the scala media could be accounted for by a generator with nonlinear properties. In addition, the models demonstrated that some, but not all, of the AECP could be produced by resistance changes in the hair cells.
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