Additional Variables on the Bekesy-Type Audiometer

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Abstract
Introduction The development of the automatic audiometer reported by Békésy2 in 1947 has provided the clinician with an extremely useful diagnostic instrument. However, despite the need for the early investigation of the various factors in the instrumentpatient combination,8 published research on this type of audiometry has been extremely limited. The first systematic study on the Békésy-type audiometer, in which the effects of testing time and signal attenuation rate were investigated, was reported by Corso4 in 1955. It was found that for inexperienced listeners (1) testing time and attenuation rate had no effect on the mean threshold value at 1000 cps; (2) attenuation rate produced a significant effect on threshold variability, and (3) attenuation rate had a significant effect on test-retest reliability. In a later study, Corso5 made a comprehensive comparison of threshold data obtained by the method of limits and the method of adjustment. In the

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