The perceptual effects of interphase gap duration in cochlear implant stimulation
The perceptual effects of interphase gap duration in cochlear implant stimulation
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DOI：
10.1016/s0378-5955(03)00177-1
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发表时间：
2003-07-01
期刊：
影响因子：
2.8
通讯作者：
Henshall, KR
中科院分区：
文献类型：
--
作者：
McKay, CM;Henshall, KR
用于人工耳蜗植入的最常见的电流脉冲形状是双相矩形脉冲。相间间隙（IPG）是指两相之间的零电流部分的持续时间。从动物单神经研究中可以得知，随着IPG的减少，双相脉冲在激活神经细胞方面的效率降低。因此，可以预测，使用较小的ipg刺激将需要使用更高的电流来维持人工耳蜗所需的响度。现代处理方案的发展通常涉及到速率参数的最大化，为了在顺序脉冲刺激中实现这一目标，必须最小化IPG和脉冲相位持续时间。本实验研究了8例耳蜗植入者使用cochlear公司生产的CI24人工耳蜗后，IPG对其响度的影响。当IPG从100降低到45和8.4 mu时，保持相同的响度需要指数级增加。IPG的影响在较低的水平下更大，在较短的脉冲持续时间（26 μ s比52 μ s）下更大，并且在测试的频率（1 kHz或4 kHz）上没有显着差异。(C) 2003 Elsevier Science B.V.版权所有
The most common current pulse shape used for cochlear implants is a biphasic rectangular pulse. The interphase gap (IPG) is the duration of the zero-current portion which lies between the two phases. It is known from single-nerve studies in animals that, as the IPG decreases, the biphasic pulse becomes less efficient in activating the nerve cell. Thus, it can be predicted that stimulation using smaller IPGs will necessitate the use of higher currents to maintain the loudness required by the cochlear implantee. The development of contemporary processing schemes commonly involves the maximization of the rate parameter, and to achieve this in sequential pulsatile stimulation, the IPG as well as the pulse phase duration must be minimized. This experiment investigated the effect of IPG on loudness in eight cochlear implantees who use the CI24 implant manufactured by Cochlear Ltd. An exponential increase in current level was required to maintain equal loudness when IPG is reduced from 100 to 45 and 8.4 mus. The effect of IPG was greater at lower levels, was greater for shorter pulse durations (26 mus compared to 52 mus), and was not significantly different for the rates (1 kHz or 4 kHz) tested. (C) 2003 Elsevier Science B.V. All rights reserved.