Salient features of otoacoustic emissions are common across tetrapod groups and suggest shared properties of generation mechanisms

Proceedings of the National Academy of Sciences of the United States of America
Christopher BergevinChristine Köppl

Abstract

Otoacoustic emissions (OAEs) are faint sounds generated by healthy inner ears that provide a window into the study of auditory mechanics. All vertebrate classes exhibit OAEs to varying degrees, yet the biophysical origins are still not well understood. Here, we analyzed both spontaneous (SOAE) and stimulus-frequency (SFOAE) otoacoustic emissions from a bird (barn owl, Tyto alba) and a lizard (green anole, Anolis carolinensis). These species possess highly disparate macromorphologies of the inner ear relative to each other and to mammals, thereby allowing for novel insights into the biomechanical mechanisms underlying OAE generation. All ears exhibited robust OAE activity, and our chief observation was that SFOAE phase accumulation between adjacent SOAE peak frequencies clustered about an integral number of cycles. Being highly similar to published results from human ears, we argue that these data indicate a common underlying generator mechanism of OAEs across all vertebrates, despite the absence of morphological features thought essential to mammalian cochlear mechanics. We suggest that otoacoustic emissions originate from phase coherence in a system of coupled oscillators, which is consistent with the notion of "coherent refle...Continue Reading

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Citations

Sep 3, 2016·The Journal of the Acoustical Society of America·Srikanta K Mishra, Zoë Dinger
Mar 3, 2018·The Journal of the Acoustical Society of America·Milan Biswal, Srikanta K Mishra
Dec 3, 2017·The Journal of the Acoustical Society of America·James B Dewey, Sumitrajit Dhar
Oct 17, 2018·Proceedings of the National Academy of Sciences of the United States of America·Christian J SumnerChristopher A Shera
Feb 3, 2020·The Journal of the Acoustical Society of America·Christopher BergevinNatasha Mhatre

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