During the past year much, if not preponderating, consideration has been given to the subject of audiometry and the question of aids to hearing. Especially does the German literature show a large number of papers on this subject. In view of the fact that Americans were in many ways the pioneers in the development of audiometers and in the study of audiometry, it seems strange that with the exception of men like Langenbeck most of the writers either pay scant attention to the American and English otologic literature or do not mention the American workers in this field at all.
Meissner1 calls attention to the fact that it is often important to be able to determine the exact state of hearing in one ear with exclusion of the other. A number of methods of shutting out or "masking" the hearing in the nontested ear are mentioned, such as the Bárány
SONNENSCHEIN R, LESHIN N. FUNCTIONAL EXAMINATION OF HEARING. Arch Otolaryngol. 1937;25(1):87–101. doi:10.1001/archotol.1937.00650010095014
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