Resonance in the External Auditory Meatus


IN investigations on the extent to which objective tests can be used to obtain information on the magnitude of the effective amplification hearing aids give to a deaf user, a knowledge of the extent to which resonance occurs in the auditory meatus is of value. In normal human beings such a resonance occurs in the region of 2,000–3,000 cycles per second and to some extent accounts for the shape of the minimum threshold hearing curve as the frequency is varied. It is possible to calculate the magnitude of the resonance from results of mechanical impedance measurements at the opening of the meatus and to demonstrate its existence by means of a probing pressure microphone which indicates increase of pressure as the probe approaches the tympanic membrane. The method has limits, however, and in addition to being inconvenient can cause damage if extreme care is not taken.

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LITTLER, T. Resonance in the External Auditory Meatus. Nature 143, 118 (1939).

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