Auditory system comparisons between sand cats and other felid species : acoustic input admittance of ears and auditory brainstem responses
Author(s)Chan, Howard F
Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
William T. Peake an John J. Rosowski.
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The sand cat, one species of the cat family, is found only in deserts and has unusually large ear canals and middle-ear air cavities. Recent work has shown that sand cat ears absorb acoustic power at low frequencies (<1 kHz) better than those of domestic cats (Huang et al. 2002). In this thesis, we test this hypothesis by comparing acoustic input- admittance, which determines acoustic power absorption, and thresholds of auditory- brainstem responses. In a zoo, measurements were made in 37 ears of 23 anesthetized specimens, including sand cats and five other felid species. Sand cats have lower mean thresholds at frequencies between 0.25 and 5 kHz by 6-9 dB than other felid species measured. However, the mean power absorption does not differ significantly. The results are consistent with the hypothesis that sand-cat hearing is unusually sensitive, but this specialization is not associated with increased power absorbed at the tympanic membrane.
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (leaves 81-82).
DepartmentMassachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology
Electrical Engineering and Computer Science.