Psychophysical measures in patients fitted with Contourâ„¢ and straight Nucleus electrode arrays
Psychophysical measures in patients fitted with Contourâ„¢ and straight Nucleus electrode arrays
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DOI：
10.1016/j.heares.2005.11.005
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发表时间：
2006-02-01
期刊：
影响因子：
2.8
通讯作者：
Cowan, RSC
中科院分区：
文献类型：
--
作者：
Cohen, LT;Saunders, E;Cowan, RSC
本研究的目的是比较使用Nucleus Contour（TM）电极阵列的患者与使用直带状电极阵列的患者的心理物理性能。特别是，我们希望考虑心理物理参数将如何不同的电极阵列定位更接近蜗轴，以及这可能会如何影响患者的利益和语音处理策略的设计。9名受试者参与了研究：4名使用Nucleus直型阵列，5名使用Nucleus Contour电极阵列。影像学分析发现，Contour阵列更靠近蜗轴，插入更深，并且比直带状电极阵列跨越更大的基底膜部分长度。结果进行了分析的阵列类型和位置的个别电极带，距离蜗轴和纵向放置。Contour阵列的平均阈值较低，但最大舒适水平相似。阈值随电极带距蜗轴距离的变化有显著性差异，而最大舒适度随电极带距蜗轴距离的变化无显著性差异。音高随着刺激电极的纵向位置而相当有规律地变化，除了一个Contour受试者。前掩蔽配置文件，使用适度响亮的掩蔽，轮廓阵列较窄，指示更本地化的神经兴奋。(c)2005 Elsevier B.V.保留所有权利。
The objective of this study was to compare the psychophysical performance of patients using the Nucleus Contour (TM) electrode array with that of patients using the straight banded-electrode array. In particular, we wished to consider how psychophysical parameters would differ for an electrode array positioned closer to the modiolus, and how this might influence both patient benefits and the design of speech processing strategies. Nine subjects participated in the study: four used the Nucleus straight array and five used the Nucleus Contour electrode array. Radiographic analyses found that the Contour array lay closer to the modiolus, was more deeply inserted and spanned a larger fractional length of the basilar membrane than the straight banded-electrode array. The results were analysed in terms of array type and of the position of the individual electrode band, both distance from the modiolus and longitudinal placement. Mean threshold was lower for the Contour array but maximum comfortable level was similar. Whereas threshold varied significantly with distance of electrode band from the modiolus, maximum comfortable level did not. Pitch varied fairly regularly with longitudinal position of the stimulated electrode, with the exception of one Contour subject. The forward masking profiles, using moderately loud maskers, were narrower for the Contour array, indicative of more localized neural excitation. (c) 2005 Elsevier B.V. All rights reserved.