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JAMES JERGER, Ph.D.; RAYMOND CARHART, Ph.D.; JOYCE LASSMAN, M.A.

AMA Arch Otolaryngol. 1958;68(5):617-623.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

In 1955, Lierle and Reger¹ reported an unusual finding in connection with their extensive studies of threshold tracings obtained with the Békésy-type audiometer. When subjects were asked simply to trace threshold for a fixed frequency over a 20-minute period, they found that the tracings remained relatively constant in two cases of end-organ lesion, but dropped markedly in one patient with a subsequently confirmed eighth-nerve tumor. In other words, in the case of end-organ lesion, the intensity level required to maintain a threshold response did not change appreciably over the 20-minute tracing period. In the case of eighth-nerve lesion, however, the patient rapidly required more and more intensity to keep the tone at threshold. Similar results were subsequently reported by Kos.²

This finding is, of course, exactly opposite to the earlier observations of Dix and Hood.³ According to these investigators, the threshold "adaptation" exemplified by the gradual decline . . . [Full Text PDF of this Article]

Author Affiliations
Evanston, III.

From the School of Speech and Department of Otolaryngology, Northwestern University.

Footnotes
Submitted for publication Feb. 10, 1958.

This investigation was supported by research grant B-1310 from the National Institutes of Health, Public Health Service.

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