An analog model by Engebretson and Eldredge accounts for nonlinear properties of the cochlear microphonic (CM) in response to single‐ and two‐tone stimulation. Recent evidence that shows strong similarities between CM and spike‐discharge patterns of single cochlear‐nerve fibers has prompted an association of two‐tone interaction of CM with two‐tone inhibition of nerve fibers, leading to a modification of the model for CM so as to make it applicable to cochlear‐nerve fibers. The result is a model that has clear two‐tone inhibition properties similar to those observed experimentally. Mathematical analysis applied to the model shows that the “inhibition” is easily explained by signal suppressions inherent to bandpass nonlinearities.

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