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首页> 外文期刊>Journal of the Association for Research in Otolaryngology: JARO >Symmetric Electrode Spanning Narrows the Excitation Patterns of Partial Tripolar Stimuli in Cochlear Implants
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Symmetric Electrode Spanning Narrows the Excitation Patterns of Partial Tripolar Stimuli in Cochlear Implants

机译：对称电极跨度缩小了人工耳蜗中部分三极刺激的激励模式

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摘要

In cochlear implants (CIs), standard partial tripolar (pTP) mode reduces current spread by returning a fraction of the current to two adjacent flanking electrodes within the cochlea. Symmetric electrode spanning (i.e., separating both the apical and basal return electrodes from the main electrode by one electrode) has been shown to increase the pitch of pTP stimuli, when the ratio of intracochlear return current was fixed. To explain the pitch increase caused by symmetric spanning in pTP mode, this study measured the electrical potentials of both standard and symmetrically spanned pTP stimuli on a main electrode EL8 in five CI ears using electrical field imaging (EFI). In addition, the spatial profiles of evoked compound action potentials (ECAP) and the psychophysical forward masking (PFM) patterns were also measured for both stimuli. The EFI, ECAP, and PFM patterns of a given stimulus differed in shape details, reflecting the different levels of auditory processing and different ratios of intracochlear return current across the measurement methods. Compared to the standard pTP stimuli, the symmetrically spanned pTP stimuli significantly reduced the areas under the curves of the normalized EFI and PFM patterns, without shifting the pattern peaks and centroids (both around EL8). The more focused excitation patterns with symmetric spanning may have caused the previously reported pitch increase, due to an interaction between pitch and timbre perception. Being able to reduce the spread of excitation, pTP mode symmetric spanning is a promising stimulation strategy that may further increase spectral resolution and frequency selectivity with CIs.
机译：在人工耳蜗（CIs）中，标准部分三极（pTP）模式通过将一部分电流返回到耳蜗内的两个相邻侧翼电极来减少电流扩散。当耳蜗内返回电流的比例固定时，对称的电极跨度（即用一个电极将顶电极和基底返回电极与主电极分开）已显示出增加了pTP刺激的音调。为了解释由pTP模式下的对称跨度引起的音高增加，本研究使用电场成像（EFI）测量了五个CI耳中主电极EL8上标准和对称跨度的pTP刺激的电位。此外，还测量了两种刺激的诱发复合动作电位（ECAP）和心理物理前向掩蔽（PFM）模式的空间分布。给定刺激的EFI，ECAP和PFM模式在形状细节上有所不同，反映了不同测量方法的听觉处理水平和耳蜗内回流电流的比率不同。与标准pTP刺激相比，对称分布的pTP刺激显着减小了归一化EFI和PFM模式曲线下的面积，而没有移动模式峰和质心（均在EL8周围）。由于音高和音色感知之间的相互作用，具有对称跨度的更加集中的激励模式可能导致先前报告的音高增加。由于能够减少激发的扩散，pTP模式对称跨越是一种有前途的刺激策略，可以进一步提高CI的频谱分辨率和频率选择性。

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