Abstract
DIRECT evidence in favour of the view that the vibrating elements of the cochlea are differentially tuned for frequency has been adduced in the following way: The cochlea of the cat is exposed under Nembutal anæsthesia. Viewing the preparation through a dissecting microscope, and using a dental burr, small excavations are now made in the bone, one proximal to the round window, the other towards the apex of the cochlea; the floor of these concavities may be made so thin that the cochlear fluids seep through, a state of affairs which may be easily seen through the microscope. At this juncture, small beads of mercury are placed in the depressions, using a micro-pipette; in this way, further loss of fluid is prevented, and a good electrical contact with the fluids of the inner ear established, by the insertion of platinum electrodes into the mercury droplets.
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HALLPIKE, C., RAWDON SMITH, A. The Helmholts Resonance Theory of Hearing. Nature 133, 614 (1934). https://doi.org/10.1038/133614a0
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DOI: https://doi.org/10.1038/133614a0
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