Bandpass shape of distortion-product otoacoustic emission ratio functions reflects cochlear frequency tuning in normal-hearing mice

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SUMMARY

    Typically elicited by two tones at frequencies f1 and f2 (f2 > f1) and measured at related frequencies such as 2f1 - f2, DPOAEs provide a noninvasive window onto cochlear mechanics. Originally attributed to a resonance of the tectorial membrane (TM) overlying the OHCs, the bandpass shape in DPOAE amplitude vs. f2/f1 ratio functions (referred to here as "ratio functions") has also been proposed to be due to suppression, the form of the underlying nonlinearity, and interference between DP waves generated at different locations. The authors explicitly tested this relationship in mice by using optical . . .

     

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