A COCHLEAR MODEL USING FEEDFORWARD OUTER-HAIR-CELL FORCES
A COCHLEAR MODEL USING FEEDFORWARD OUTER-HAIR-CELL FORCES
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DOI：
10.1016/0378-5955(95)00064-b
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发表时间：
1995-06-01
期刊：
影响因子：
2.8
通讯作者：
SANG, CN
中科院分区：
文献类型：
--
作者：
GEISLER, CD;SANG, CN
已经开发出猫耳蜗的线性（频域）模型（以一维和二维版本实现），该模型在几何形状中使用外毛细胞 (OHC) 力，其中包括外毛细胞 (OHC) 的纵向（基部到顶点）倾斜。当使用正（收缩）实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（可以达到-50 pi弧度），纵向分段越宽，峰值越宽，相位累积越少； 71 微米分割产生了最真实的响应。这些大响应峰值是通过位于响应峰值底部的小负电阻区域（约 1 毫米）和整个峰值区域（约 2.5 毫米）上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 产生大约 25 倍的传入声功率。相比之下，对于所使用的所有分割宽度，在模型的 OHC 表示中包含低通滤波会产生非常不切实际的陷波和峰值位移复合体，并伴有非常大的相位滞后。然而，当还添加 OHC 力的相位反转（通过在盖膜内嵌入谐振系统来实现）时，会产生非常真实的峰值和相位函数。然而，OHC 必须产生更多的电力（大约是输入电力的 70 倍）。最终结果是非常接近地模拟活体基底膜对低强度高频音调的响应的输出。
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-mu m 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.