A nonlinear mechanical model of the peripheral auditory system: interpretation of neurally and acoustically observed distortion products (2f1-f2) and (f2-f1)

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Abstract
The model postulates linear dynamics of the middle ear, linear two-dimensional hydrodynamics of the cochlear fluid [Spenner and Cox, J. Acoust. Soc. Am. 62, S12(A) (1977)], and nonlinear dynamics of the basilar membrane relating transmembrane pressure to basilar-membrane motion. The model is solved digitally in the time domain in order to interpret two experimentally observed nonlinear phenomena: (1) propagating distortion products in the spatial distributions of the responses of populations of single cochlear nerve fibers [Kim et al., Scand. Audiol., (in press)], and (2) recent observations of distortion products in acoustic signals in the ear canal [Kemp, Arch. Otorhinolaryngol. (NY) (in press) and Kim (in preparation)]. Preliminary resulting from this model, as well as previous modeling results [Hall, J. Acoust. Soc. 56, 1818–1828 (1974)], show qualitative agreement with observations of the first phenomenon. [Supported by NIH grants: NS07498; RR00396; NS00162.]

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