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Analysis of Selected Fixed Frequency Bekesy Tracings
Carol H. Ehrlich, PhD
Arch Otolaryngol. 1971;93(1):12-24.
Abstract
Sixty-eight fixed frequency Bekesy tracings with patterns suggesting retrocochlear lesions were analyzed. Continuous tone (C) threshold minus interrupted tone (I) threshold, amplitudeC, amplitudeCre amplitudeI, rate of decayC, and pattern category were determined for each tracing. Medical diagnoses were related to these characteristics and a means of interpreting Bekesy audiograms for cochlear or retrocochlear malfunction is suggested in a table of probabilities drawn from the data. Significant indicators of retrocochlear lesions were thresholdC minus thresholdI > 26 dB, rate of decayC > 0.49 dB/sec, and decay pattern A, all measured at low, mid, and high frequencies. The best indicator of cochlear lesions was amplitudeC < 6 dB at low frequencies. Contrary to expectation, neither small amplitudeC at mid and high frequencies nor a relative amplitude measure at any frequency was found to be an effective discriminator of the site of lesion.
Author Affiliations
New York
From the Department of Otolaryngology, College of Physicians and Surgeons, Columbia University, and the Columbia Presbyterian Medical Center, New York. Dr. Ehrlich is now at the Department of Audiology and Speech Pathology, Children's Hospital, Denver.
Footnotes
Accepted for publication July 28, 1970.
An earlier version of this paper was read before the American Speech and Hearing Association meeting, Chicago, Nov 14, 1969.
Reprint requests to Department of Audiology and Speech Pathology, Children's Hospital, 1056 E 19th Ave, Denver 80218.
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