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December 1958

Recruitment Measured by Automatic Audiometry

Author Affiliations

Lubbock, Texas
Assistant Professor of Speech and Director of the Speech and Hearing Clinic, Texas Technological College.

AMA Arch Otolaryngol. 1958;68(6):685-696. doi:10.1001/archotol.1958.00730020709005

Introduction  Because loudness recruitment has assumed significant clinical and diagnostic importance, many tests have been devised to demonstrate its presence. One such test involves automatic audiometry. In 1947, when Békésy1 first described his automatic audiometer, he also suggested that the amplitude of excursions of the audiometric tracing gives a measure of the difference limen (DL) for intensity. It was further reasoned that if recruitment were the result of an abnormally rapid growth of loudness, this rapid growth should be the result of diminished DL's. Therefore, diminished excursions in automatic audiometry have been taken as direct indications of the presence of recruitment.The identity of diminished excursions on the automatic audiogram with DL's and recruitment has been supported by such authors as Reger,9 Lundborg,4 and Meurman.5 On the other hand, Palva,6 one of the more prolific critics of the measurement of recruitment by automatic audiometry, has

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