Effects of stimulation mode on threshold and loudness growth in multielectrode cochlear implants
Effects of stimulation mode on threshold and loudness growth in multielectrode cochlear implants
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DOI：
10.1121/1.426274
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发表时间：
1999-02-01
影响因子：
2.4
通讯作者：
Chatterjee, M
中科院分区：
文献类型：
--
作者：
Chatterjee, M
在4名使用Nucleus-22人工耳蜗术的患者中，研究了增加刺激电极对的两个成员之间间隔的效果。进行了两个实验。在实验1中，测量了200ms、500脉冲/S两相脉冲串的探测阈值，测量了有源电极和返回电极之间的空间间隔增加。在实验2中，测量了随着电极间距的增加响度-增长函数。实验1的结果表明：(A)随着电极间距的增加，阈值单调地向渐近线(单极阈值)减小；(B)阈值与电极间距的函数在不同受试者和不同电极位置之间是相似的。实验2的结果表明，响度L与电流幅度i之间存在一个简单的指数函数关系：L=e(βi)，其中，响度函数的指数β在一次近似下与刺激对的电极间距线性相关。因此，响度增长的动态范围和形状可以直接与有源电极和返回电极之间的空间间隔联系在一起。(C)1999年美国声学学会。[S0001-4966(99)00602-5]。
The effect of increasing the separation between the two members of a stimulating electrode pair was studied in four users of the Nucleus-22 cochlear implant. Two experiments were performed. In experiment 1. detection threshold for a 200-ms, 500-pulses/s biphasic pulse train was measured as the spatial separation between the active and return electrodes was increased. In experiment 2, loudness-growth functions were measured as the electrode separation was increased. The results of experiment 1 indicate that (a) threshold decreases monotonically toward an asymptote (monopolar threshold) as the electrode separation is increased and (b) the threshold versus electrode separation function is similar across subjects and electrode location. The results of experiment 2 indicate that loudness L is related to the current amplitude I by a simple exponential function: L=e(beta I), where beta, the exponent of the loudness function, is, to a first approximation, linearly related to the separation between the electrodes of the stimulating pair. Thus, dynamic range and the shape of loudness growth can be directly linked to the: Spatial separation between active and return electrodes. (C) 1999 Acoustic Society of America. [S0001-4966(99)00602-5].