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April 1956


Author Affiliations

Los Angeles

AMA Arch Otolaryngol. 1956;63(4):449-453. doi:10.1001/archotol.1956.03830100107019

THE EXHIBIT Your Ear and Noise was designed to present the presently known facts on noise-induced hearing loss.

The first step in any hearing-conservation program is to study the offending agent—noise. Such a study is incomplete unless it provides both the over-all noise level and a spectrum analysis. Panel 1 is a graph made from analyses of typical industrial noises.

Panel 2 indicates that noises unaccompanied by blast have no effect on the external and middle ear.

Panel 3 presents a diagram representing the cochlea and indicating the approximate location of the common audiometric frequencies. There is also a cross section of the organ of Corti through the approximate position of 4000 cps, where noise damage usually begins. This panel indicates that noise-induced hearing loss is an irreversible nerve-type hearing loss not amenable to therapy.

Panel 4 presents a typical audiogram taken from a case with known noise-induced hearing

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