Diagnostic Value of Bekesy Comfortable Loudness Tracings

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Abstract
Bekesy tracings were obtained at "comfortable loudness," rather than at threshold, in 164 ears. Bekesy comfortable loudness (BCL) audiograms could be divided into six different patterns on the basis of the relation between interrupted and continuous tracings. Three patterns showed no unusual adaptation for the continuous tracing in comparison to the interrupted tracing. These patterns were found in normal listeners and patients with conductive and cochlear hearing disorders. Three other patterns yielded unusual discrepancies between interrupted and continuous tracings or between continuous forward and continuous backward tracings. These patterns characterized patients with eighth nerve or extra-axial brain stem disorders. Results on a battery of selected audiometric tests showed that BCL tracings were a valuable adjunct to conventional Bekesy audiometry.

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