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The effects of air pressure on spontaneous otoacoustic emissions of lizards. | LitMetric

The effects of air pressure on spontaneous otoacoustic emissions of lizards.

J Assoc Res Otolaryngol

Department of Otorhinolaryngology, Head & Neck Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.

Published: June 2013

AI Article Synopsis

Article Abstract

Small changes of air pressure outside the eardrum of five lizard species led to changes in frequency, level, and peak width of spontaneous otoacoustic emissions (SOAE). In contrast to humans, these changes generally occurred at very small pressures (<20 mbar). As in humans, SOAE amplitudes were generally reduced. Changes of SOAE frequency were both positive and negative, while in humans, they are mostly positive. In addition, in lizards, these effects often showed obvious hysteresis and non-repeatability. The correlation between peak width and height was negative in two species (comparable to humans) and positive in one species. In two other species, no correlation was found. Consequently, a simple oscillator model that explained the negative correlation in humans could not be generally applied to lizards. This presumably reflects the fact that in lizards, the spontaneous otoacoustic emission of sound from the ear consists of a combination of stable oscillations (as in humans), unstable narrow-band oscillations, and broad-band emissions, evident as "plateaus" in emission spectra.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3642271PMC
http://dx.doi.org/10.1007/s10162-013-0385-0DOI Listing

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