Spatial resolution of cochlear implants: the electrical field and excitation of auditory afferents

被引:225
作者
Kral, A
Hartmann, R
Mortazavi, D
Klinke, R
机构
[1] Physiol Inst 3, D-60590 Frankfurt, Germany
[2] Inst Pathol Physiol, SK-81108 Bratislava, Slovakia
关键词
cochlear implant; electrical stimulation; auditory single fiber; spatial resolution; lateral inhibition;
D O I
10.1016/S0378-5955(98)00061-6
中图分类号
R36 [病理学]; R76 [耳鼻咽喉科学];
学科分类号
100104 ; 100213 ;
摘要
This paper investigates the spatial resolution of electrical intracochlear stimulation in order to enable further refinement of cochlear implants. For this purpose electrical potential distributions around a conventional human intracochlear electrode (NUCLEUS-22) were measured in a tank, in cat cadaver cochleae and in living cat cochleae. Potential gradients were calculated where of importance. The values were compared to spatial tuning curves from cat primary auditory afferents in electrical mono-, bi-, and various tripolar stimulation modes. Finally, a lumped element model was developed to elucidate the single fiber data. Tank potential measurements show the principal features of the different stimulation modes but are not sufficient to explain all the features of experimental data from single fibers. Intracochlear potential measurements indicate an increase in spatial resolution in an apical direction. The single fiber data also confirm that a tripolar stimulus configuration provides significantly better spatial resolution than any other stimulation mode presently in use. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:11 / 28
页数:18
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