A cochlear model using feed-forward outer-hair-cell forces.

摘要: A linear (frequency-domain) model of the cat cochlea (implemented in both 1- and 2-dimensional versions) has been developed which uses outer hair cell (OHC) forces a geometry includes longitudinal (base-to-apex) tilt cells (OHCs). When positive (contractile) real OHC force-constants are used, very large (50 + dB) response peaks along with rapidly accumulating phase lags (which can reach -50 pi radians) obtained. The wider segmentation, broader less accumulation; 71-microns segmentation produced most realistic responses. These achieved by small zone negative resistance (ca. 1 mm) just basal to peak virtual 'zeroing' basilar membrane's effective impedance over entire region 2.5 mm). To produce these peaks, OHCs generate about 25-times incoming acoustic power. Inclusion low-pass filtering model's representation produces, contrast, unrealistic notch-and-peak displacement complexes accompanied lags, for all widths used. However, when reversals also added, imbedding resonant system within tectorial membrane, functions produced. More power must, however, be generated (about 70-times incoming). end result is output mimics quite closely living responses low-intensity high-frequency tones.