Geisler C D, Sang C
Department of Neurophysiology, University of Wisconsin-Madison 53706, USA.
Hear Res. 1995 Jun;86(1-2):132-46. doi: 10.1016/0378-5955(95)00064-b.
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 in a geometry which includes the longitudinal (base-to-apex) tilt of the outer hair cells (OHCs). When positive (contractile) real OHC force-constants are used, very large (50 + dB) response peaks along with very rapidly accumulating phase lags (which can reach -50 pi radians) are obtained. The wider the longitudinal segmentation, the broader the peaks and the less the phase accumulation; 71-microns segmentation produced the most realistic responses. These large response peaks are achieved by a small zone of negative resistance (ca. 1 mm) just basal to the response peak and the virtual 'zeroing' of the basilar membrane's effective impedance over the entire peak region (ca. 2.5 mm). To produce these peaks, the OHCs generate about 25-times the incoming acoustic power. Inclusion of low-pass filtering in the model's OHC representation produces, by contrast, very unrealistic notch-and-peak displacement complexes accompanied by very large phase lags, for all segmentation widths used. However, when phase reversals of OHC forces are also added, achieved by imbedding a resonant system within the tectorial membrane, very realistic peaks and phase functions are produced. More power must, however, be generated by the OHCs (about 70-times the incoming). The end result is output which mimics quite closely the living basilar membrane's responses to low-intensity high-frequency tones.
已经开发出一种猫耳蜗的线性（频域）模型（有一维和二维版本），该模型在一种几何结构中使用外毛细胞（OHC）力，这种几何结构包括外毛细胞的纵向（从基部到顶部）倾斜。当使用正的（收缩性的）实际OHC力常数时，会获得非常大（50 + dB）的响应峰值以及非常快速累积的相位滞后（可达到 -50π 弧度）。纵向分割越宽，峰值越宽且相位累积越少；71微米的分割产生了最逼真的响应。这些大的响应峰值是通过在响应峰值基部刚好有一个小的负阻区域（约1毫米）以及在整个峰值区域（约2.5毫米）基底膜有效阻抗的虚拟“归零”来实现的。为了产生这些峰值，OHC产生的功率约为入射声功率的25倍。相比之下，在模型的OHC表示中包含低通滤波，对于所有使用的分割宽度，都会产生非常不现实的凹口和峰值位移复合体以及非常大的相位滞后。然而，当通过在盖膜内嵌入一个共振系统来添加OHC力的相位反转时，会产生非常逼真的峰值和相位函数。然而，OHC必须产生更多的功率（约为入射功率的70倍）。最终结果是输出非常接近活体基底膜对低强度高频音调的响应。
