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Round window implants are being used to address medical conditions such as conductive hearing loss. They stimulate the cochlea in reverse way to that for natural stapes stimulation. Current paper studies effect of this reverse stimulation on cochlear mechanics using one-dimensional, macro-mechanical, passive model of human cochlea as given by Peterson and Bogert. For round window stimulation, cochlear motion at oval window experiences impedance as seen by cochlea towards middle ear. Value of this impedance is estimated with help of middle ear impedance model given by Puria and Allen. Extending the mathematical model of cochlea with boundary conditions for reverse stimulation by round window implants, cochlear response is formulated. Also, cochlear response is formulated for additional boundary condition related to rigid round window condition occurring in some physiological conditions due to excessive bone growth in naturally working ear. We found that peak displacement lies at same position in frequency response for all cases of boundary conditions considered; meaning frequency tuning remains same even if cochlea is stimulated by round window implants. Response of basilar membrane is observed to be very sensitive with value of impedance seen by cochlea at oval window. Related results are further discussed in the paper.
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