As noted in the last review,1 so again we observe that the number of papers published on functional testing of hearing is not very large. Furthermore, the articles in the American and the English literature far outnumber those in the German.
According to Fletcher,2 the advice now given patients with impaired hearing regarding the use of hearing devices, namely, that they try two or three different sets and then determine for themselves which, if any, is the best for them, is far from satisfactory from the patient's point of view. The author presents some facts which have been determined in the research studies of the Bell Telephone Laboratories bearing on this subject which may aid otologists in enabling them to give their patients scientific advice on this subject.
The variations of the level of speech for a person with normal hearing cover a range of from 40 to
SONNENSCHEIN R, LESHIN N. FUNCTIONAL TESTS OF HEARING. Arch Otolaryngol. 1934;19(1):70–98. doi:10.1001/archotol.1934.03790010077010
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