Effects of electrode configuration on cochlear implant modulation detection thresholds
Effects of electrode configuration on cochlear implant modulation detection thresholds
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DOI：
10.1121/1.3583543
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发表时间：
2011-06-01
影响因子：
2.4
通讯作者：
Pfingst, Bryan E.
中科院分区：
文献类型：
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作者：
Pfingst, Bryan E.
通过心理物理测量评估的耳蜗植入功能在患者耳蜗内从一个刺激部位到另一个刺激部位是不同的。这表明，通过选择处理器映射的最佳功能部位，可能会改善患者的表现。在评估这种策略的刺激部位时，电极配置是一个重要的变量。使用双极电极配置进行刺激时，响度相关测量（检测阈值和最大舒适响度水平）在刺激部位之间的变化比使用单极配置时要大得多。目前的研究发现，在与清醒相关的措施，跨站点的手段和跨站点的调制检测阈值的变化幅度不依赖于电极配置，这表明在这些不同的心理物理措施的变化的机制是不完全相同的。此处提供的数据表明，双极和单极电极配置在识别调制检测的良好和不良刺激部位方面同样有效，但两种配置的调制检测阈值的跨部位模式不同。因此，建议在对患者的调制检测灵敏度进行心理物理评估时，使用患者的临床指定电极配置测试所有刺激部位，以选择处理器标测图的部位。(C)2011年美国声学学会。[DOI：10.1121/1.3583543]
Cochlear implant function, as assessed by psychophysical measures, varies from one stimulation site to another within a patient's cochlea. This suggests that patient performance might be improved by selection of the best-functioning sites for the processor map. In evaluating stimulation sites for such a strategy, electrode configuration is an important variable. Variation across stimulation sites in loudness-related measures (detection thresholds and maximum comfortable loudness levels), is much larger for stimulation with bipolar electrode configurations than with monopolar configurations. The current study found that, in contrast to the loudness-related measures, magnitudes of across-site means and the across-site variances of modulation detection thresholds were not dependent on electrode configuration, suggesting that the mechanisms underlying variation in these various psychophysical measures are not all the same. The data presented here suggest that bipolar and monopolar electrode configurations are equally effective in identifying good and poor stimulation sites for modulation detection but that the across-site patterns of modulation detection thresholds are not the same for the two configurations. Therefore, it is recommended to test all stimulation sites using the patient's clinically assigned electrode configuration when performing psychophysical evaluation of a patient's modulation detection acuity to select sites for the processor map. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3583543]