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The influence of stimulus intensity on spike timing and the compound action potential in the electrically stimulated cochlea: a model study

机译:刺激强度对电刺激的耳蜗突触时间和复合动作电位的影响:模型研究

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In order to get more insight in the fundamentals of electrical stimulation of the auditory nerve by cochlear implants we developed a rotationally symmetric volume conductor model of the implanted inner ear (cochlea), using the boundary element method. The neural responses are calculated with a multiple nonlinear node model of auditory nerve fibers. In the present paper this model is used to study the relative timing of the spikes elicited in different locations in the (tonotopically organized) cochlea. This timing information is used in conjunction with the so-called unit response to synthesize compound action potentials of the auditory nerve. It is concluded that increasing the intensity of biphasic pulses on longitudinal bipolar electrodes significantly affects the time relations between spikes elicited in fibers at different positions in the cochlea. This might well have perceptual consequences, while it is poorly reflected in the compound action potential as measured at the round window.
机译:为了对耳蜗植入物对听觉神经电刺激的基本原理有更多的了解,我们使用边界元方法开发了植入的内耳(耳蜗)的旋转对称体积导体模型。用听神经纤维的多个非线性节点模型计算神经反应。在本论文中,该模型用于研究在(局部组织的)耳蜗中不同位置产生的尖峰的相对时间。该定时信息与所谓的单位响应结合使用,以合成听神经的复合动作电位。结论是,增加纵向双极电极上的双相脉冲的强度会显着影响耳蜗中不同位置的纤维中产生的尖峰之间的时间关系。这很可能会产生感知上的后果,而在圆窗处测得的复合动作电位中却很难反映出来。

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