Relation Between The Waveform Of The Cochlear Whole Nerve Action Potential And Its Intensity Function

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Abstract
The whole-nerve action potential (AP) was recorded by intracochlear electrodes in the guinea-pig. As is well known, in normal conditions, the AP elicited by tone bursts displays negative and positive deflections. In-activation of the central end of the nerve at the internal auditory meatus (IAM), by introduction of a few drops of KCI solution, or by mechanical pressure, produces a change in the wave shape of the AP which is transformed into a single negative deflection. The relation of the amplitude of the monophasic AP to the intensity of the tone burst is monotonic, in contrast to the classical two-slope variation observed in normal conditions. These results ate interpreted by the disappearance of a positive component of the response produced at the IAM. The convolution of the monophasic unit AP would explain the monotonic intensity function.