Spontaneous otoacoustic emissions in chinchilla ear canals: correlation with histopathology and suppression by external tones

Hearing Research
W W ClarkB A Bohne

Abstract

Two cases of spontaneous otoacoustic emissions (SOAEs) have been found among a sample of 28 chinchilla ears after noise exposure, and no cases of SOAEs have been found among 28 unexposed ears. Further observations of the characteristics of SOAEs recorded in the ear canals of two chinchillas after noise exposure are described. These signals were tonal, robust, and could be suppressed by presenting external tones to the ear. Histopathological evaluation of the cochlea of emitting ears revealed discrete basal-turn lesions near the positions corresponding to the frequencies of the emissions. Behavioral threshold shifts measured in one animal after noise exposure and acoustic intermodulation distortion product behavior in the other both suggest a region of increased vibratory response of the cochlear partition near the location of the SOAE. Results from these emitting ears support a hypothesis that a punctate loss of the organ of Corti (OC) may facilitate the occurrence of an SOAE. We further hypothesize that the following conditions are both necessary and sufficient for an SOAE to occur: (1) functional disruption of a normally present biomechanical control mechanism in a region of the OC; (2) presence of functionally active OC (esp...Continue Reading

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Citations

Aug 1, 1993·European Journal of Pediatrics·P G Zorowka
Jan 28, 2005·Journal of the Association for Research in Otolaryngology : JARO·A L NuttallT Ren
Sep 10, 2013·Journal of the Association for Research in Otolaryngology : JARO·Karolina K CharaziakJonathan H Siegel
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