PITCH PERCEPTION FOR DIFFERENT MODES OF STIMULATION USING THE COCHLEAR MULTIPLE-ELECTRODE PROSTHESIS
PITCH PERCEPTION FOR DIFFERENT MODES OF STIMULATION USING THE COCHLEAR MULTIPLE-ELECTRODE PROSTHESIS
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DOI：
10.1121/1.409835
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发表时间：
1994-05-01
影响因子：
2.4
通讯作者：
CLARK, GM
中科院分区：
文献类型：
--
作者：
BUSBY, PA;WHITFORD, LA;CLARK, GM
对9名语言后失聪成人使用由cochlear Pty公司制造的22电极人工耳蜗进行了音高的数值估计。有限的。阵列上的一系列电极采用三种刺激模式：双极（BP）、共地（CG）和单极（MONO）。在血压刺激中，电流在两个电极之间传递，八个病人用一个电极隔开，一个病人用两个电极隔开。在CG刺激中，单个电极被激活，阵列上的其他电极连接在一起，作为电流的返回路径。在单极刺激中，电流在单个电极和阵列上最基本的电极之间传递。音高估计大体上与耳蜗的张力异位组织一致。使用CG刺激的三名患者在阵列中间电极的音高有明显的反转。使用MONO刺激减少的音高范围被记录在最基础电极位于耳蜗内部的患者。对于大多数患者来说，在三种刺激模式之间的音高估计也存在个体差异。一般来说，触发阈值(T)和舒适聆听(C)所需的电流水平在BP刺激下高于CG刺激，而在MONO刺激下最低。对于CG刺激，阵列中间电极的T和C水平有高于基端或顶端电极的趋势。在MONO刺激下，大多数患者的T和C水平呈尖向基底方向均匀升高。血压刺激的T和C水平没有一致的模式。CG刺激与BP刺激的可用听力范围大小趋于相近，且通常高于MONO刺激。
Numerical estimations of pitch were obtained from nine postlinguistically deafened adults using the 22-electrode cochlear implant manufactured by Cochlear Pty. Limited. A series of electrodes on the array were stimulated using three modes of stimulation: Bipolar (BP), common ground (CG), and monopolar (MONO). In BP stimulation, an electric current was passed between two electrodes separated by one electrode for eight patients and two electrodes for one patient. In CG stimulation, a single electrode was activated and the other electrodes on the array were connected together to serve as the return path for the current. In MONO stimulation, an electric current was passed between a single electrode and the most basal electrode on the array. Pitch estimations were generally consistent with the tonotopic organization of the cochlea. There was a marked reversal in pitch for electrodes in the middle of the array using CG stimulation for three patients. A reduced range of pitch using MONO stimulation was recorded for patients where the most basal electrode was internal to the cochlea. There were also individual differences in pitch estimations between the three modes of stimulation for most patients. The current levels required to elicit threshold (T) and comfortable listening (C) levels were, in general, higher for BP stimulation than for CG stimulation and were lowest for MONO stimulation. For CG stimulation, there was a tendency for T and C levels to be higher for electrodes in the middle of the array than at the basal or apical ends. For MONO stimulation, T and C levels uniformly increased in an apical to basal direction for the majority of patients. There was no consistent pattern in T and C levels for BP stimulation. The size of the range of usable hearing using CG stimulation tended to be similar to that using BP stimulation and was usually higher than that using MONO stimulation.