On the mechanics of the horseshoe bat cochlea

H. Duifhuis, M. Vater

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


    The basilar membrane (BM) in the greater horseshoe bat has a peculiar thickness and width profile, which suggests that BM-stiffness in the basal half turn is more than one order of magnitude greater than in the second half turn and more apically. The transition is quite abrupt.

    Motivated by new data on the cochlear frequency map we analyse the possibility that the stiffer basal half turn acts as an acoustic interference filter. Its increased stiffness and impedance transitions at the stapes and at the transition mentioned, make this a feasible mechanism. We propose that 2¼ wavelengths of the reflected call frequency of the echolocating bat match the length of the interference filter. Using a scaled version of the middle ear description given by Matthews (1980) and linear, passive, long-wave, 1-dimensional cochlear mechanics we analyse the effect of the interference filter and compute the tympanic membrane input impedance. Experimental data on the latter (Wilson and Bruns, 1983a) are interpreted in terms of the proposed mechanism: fine structure in the input impedance appears to reflect the interference filter passbands.
    Original languageEnglish
    Title of host publicationPeripheral auditory mechanisms : proceedings of a conference held at Boston University, Boston, MA, August 13-16, 1985
    EditorsJ.B. Allen, J.L. Hall, A. Hubbard, S.T. Neely, A. Tubis
    Place of PublicationBerlin
    ISBN (Print)0387160957, 3540160957
    Publication statusPublished - 1986
    EventConference on Peripheral auditory mechanisms - Boston University, Boston, United States
    Duration: 13 Aug 198516 Aug 1985

    Publication series

    NameLecture notes in biomathematics


    ConferenceConference on Peripheral auditory mechanisms
    Country/TerritoryUnited States


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