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Hear Res. 1989 Mar;38(1-2):47-56.

Rapid assessment of sound-evoked olivocochlear feedback: suppression of compound action potentials by contralateral sound.

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Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts.


The compound action potential (CAP) measured at the round window of anesthetized cats in response to low-level tone pips can be significantly suppressed by addition of tones or noise to the opposite ear. This contralateral-sound suppression disappears upon transection of the olivocochlear bundle. The frequency and level dependence of the suppression phenomenon are well explained by known sound-evoked discharge properties of single olivocochlear neurons. Thus, the contralateral-sound suppression of cochlear CAP should prove useful as a rapid measure of the magnitude of the sound-evoked efferent feedback to the cochlea.

[Indexed for MEDLINE]

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