Studies on the Endolymphatic dc Potential of the Guinea Pig's Cochlea

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Abstract
The effect of loud sound on the endolymphatic dc potential was studied in normal and hypoxic animals. When the integrity of the cochlear wall was maintained, the endolymphatic dc potential of both normal and hypoxic animals decreased 5 mv with the onset of sound (1000 cps below 140 db) and recovered immediately when the sound was terminated. A negative dc potential was found in the scala media of hypoxic and dead animals, and this potential survived the life span of the post-mortem microphonics. The positive dc potential returned on termination of hypoxia. Oxygen deprivation resulted in the dc potential decreasing before the microphonics. The possible significance of these finding to the physiology of hearing is discussed.

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