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Abstract
A method is described for the quantitative performance of the test of Gellé, the tone threshold for air- as well as bone-conduction as a function of air-pressure in the auditory canal being determined by amplitude modulation. Special attention is paid to the influence of the occlusion effect and the necessity for masking in bone-conduction measurements.
The author has tried to determine the range in which the results may vary, for normals as well as for patients with otosclerosis. In agreement with many other investigators, it has been found that in cases of stapedial ankylosis the bone-conduction threshold is not affected by air-pressure changes in the auditory canal. An attempt is made to explain this phenomenon.