CONTRIBUTIONS to the physiology and psychology of hearing and articles dealing with acoustic physics are apparently on the increase, and, as in the previous year, much credit goes to the Scandinavian countries, with the United States not far behind. On the other hand, there is an apparent decrease in contributions on the functional tests of hearing of immediate interest to the clinician. Rehabilitation continues its upward trend, and the number, and we hope the quality, of hearing aids is increasing.
A review of some experiments with binaural hearing aids is reported by Hirsh.1 The binaural summation averaged 3 db. for pure tones and the same for speech intelligibility at threshold. Smaller differences in frequency also can be detected binaurally. In the presence of a masking noise this summation decreases or disappears. At 35 db. there is a summation of loudness of 6 db. Using a monaural hearing
LEWY A, SHAPIRO SL, LESHIN N. FUNCTIONAL EXAMINATION OF HEARING. AMA Arch Otolaryngol. 1951;54(2):201–222. doi:10.1001/archotol.1951.03750080089017
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