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October 1967

Békésy Audiometry: Type 2 Versus Type 4 Patterns

Author Affiliations

Los Angeles
From the Otologic Medical Group (Dr. Hughes), San Diego Speech and Hearing Center (Mr. Winegar), and the University of Southern California School of Medicine (Dr. Crabtree).

Arch Otolaryngol. 1967;86(4):424-430. doi:10.1001/archotol.1967.00760050426013

BEKESY AUDIOMETRY is currently enjoying wide application as a diagnostic tool because of recent studies by Jerger.1,2 This audiometric procedure is often utilized as part of a test battery to help distinguish between cochlear and retrocochlear lesions. With the increasing importance of being able to differentiate between cochlear and retrocochlear lesions at a very early date, audiometric data assume an even more important role.

Whatever may be the psychophysical basis for the deviations observed in threshold responses of a subject to the sustained and interrupted tones of Békésy audiometry, five grossly distinct patterns do occur. Classifications of the tracings is currently based on (1) the area along the frequency continuum in which the curve of the continuous (C) tone separates from the curve for the interrupted (I) signal and (2) the extent and direction of the separation in decibels.

As initially described by Jerger,1 the type 2 tracing is

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