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Carlos Morales-Garcia, MD; J. Derrick Hood, DSc, PhD

Arch Otolaryngol. 1972;96(3):231-247.

Abstract
The tone decay test was carried out upon normal subjects and patients with a variety of pathological conditions. With normal hearing and conductive deafness, tone decay termed type I was minimal and never exceeded 15-dB. In endorgan deafness type I predominated but a few exhibited slightly greater decay termed type II. Type IV, in which the threshold elevation was severe and rapid, was a characteristic finding in 15 subjects with nerve fiber lesions, including 12 with cerebellopontile angle tumors.

Of 52 patients with brain stem lesions a well marked, but slow rate, tone decay type III, was found in a significant proportion including a number with normal hearing. In the latter, good correlation was established between lateralization of the lesion effected by the caloric and the tone decay tests.

Author Affiliations
London

From the Medical Research Council Hearing and Balance Unit, Institute of Neurology, National Hospital, Queen Square, London.

Footnotes
Accepted for publication Feb 15, 1972.

Reprint requests to MRC Hearing and Balance Unit, Institute of Neurology, National Hospital, Queen Square, London WCIN 3BG (Dr. Hood).

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