A Comparative Analysis of Middle-Ear Function in Non-Mammalian Vertebrates

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Abstract
Mössbauer techniques were used to measure response patterns of the tympanic membrane and stapes footplate in five non-mammalian vertebrates. The response amplitude in microns was calculated for both structures at 100 dB S.P.L. for tones between 62 Hz and 10.0 kHz. The response amplitude was constant for low frequencies while above 2 kHz it tended to rapidly roll-off reaching a rate of between 25–30 dB/octave. The results suggest that the limits of high frequency hearing in these species are related to the transmission characteristic of the middle-ear.

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