Using current steering to increase spectral resolution in CII and HiRes 90K users
Using current steering to increase spectral resolution in CII and HiRes 90K users
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DOI：
10.1097/aud.0b013e31803150de
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发表时间：
2007-04-01
期刊：
影响因子：
3.7
通讯作者：
Litvak, Leonid
中科院分区：
文献类型：
--
作者：
Koch, Dawn Burton;Downing, Mark;Litvak, Leonid
目标：HiResolution仿生耳具有使用电流引导创建虚拟频谱通道的能力。通过将电流同时输送到成对的相邻电极，假设可以通过改变输送到成对电极中的每个电极的电流的比例来将刺激的有效位点引导到触点之间的部位。因此，理论上，可以通过对递送到每个电极的电流的比例和幅度的精细控制来创建刺激的许多中间区域。本研究调查的频谱通道的数量或不同的音高，可以解决成人用户的CII和HiRes 90 K人工耳蜗植入体时，电流转向施加到三对电极沿着植入的array.Design：受试者是postlinguisticallened成年人招募的一般CII和HiRes 90 K用户群体在11个参与研究网站。在响度平衡和音高排序电极对（2和3，8和9，13和14）之后，使用自适应范例来估计当实现电流引导时对于每对可以听到的中间音高感知的数量。这些数据用于估计每个电极对的光谱通道的潜在数量。来自57只植入耳朵的数据表明，每个电极对的频谱通道数量范围从1个（无法区分电极的受试者）到52个（对中间阵列电极对有52个不同音高感知的个体）。可区分的光谱通道的平均数量对于基底电极对为5.4，对于中间阵列电极对为8.7，并且对于顶端电极对为7.2。假设这三个电极对的光谱通道的平均数量代表整个16触点阵列，则可以估计光谱通道的潜在总数。57耳的潜在通道数为8 ~ 466个，平均93个。HiResolution仿生耳能够通过相邻电极触点的同时刺激来引导电流。这些数据表明，当实施电流引导时，大多数受试者感知到除了与固定电极的刺激相关联的频谱通道之外的其他频谱通道。结果表明，平均人工耳蜗用户可能有显着更多的地方音高能力比目前利用人工耳蜗系统。电流引导将在可穿戴的声音处理策略中实现，该策略可以为CII和HiRes 90 K接收者提供多达120个频谱通道。新策略利用了CII/HiRes 90 K植入式电子设备的未开发功能，并将通过软件实施，无需额外手术。预期由电流导引提供的改进的频谱分辨率将导致噪声中的更好的语音感知和改进的音乐欣赏。
Objectives: The HiResolution Bionic Ear has the capability of creating virtual spectral channels using current steering. Through simultaneous delivery of current to pairs of adjacent electrodes, it is hypothesized that the effective locus of stimulation can be steered to sites between the contacts by varying the proportion of current delivered to each electrode of the pair. Thus, theoretically, many intermediate regions of stimulation can be created with fine control over the proportion and amplitude of current delivered to each electrode. This study investigated the number of spectral channels-or different pitches-that could be resolved by adult users of the CII and HiRes 90K cochlear implants when current steering was applied to three pairs of electrodes along the implanted array.Design: Subjects were postlinguistically deafened adults recruited from the general CII and HiRes 90K user populations at 11 participating study sites. After loudness balancing and pitch ranking electrode pairs (2 and 3,8 and 9,13 and 14), an adaptive paradigm was used to estimate the number of intermediate pitch percepts that could be heard for each pair when current steering was implemented. Those data were used to estimate the potential number of spectral channels for each electrode pair.Results. Data from 57 implanted ears indicated that the numbers of spectral channels per electrode pair ranged from one (subjects who could not tell the electrodes apart) to 52 (an individual who had 52 different pitch percepts for the midarray pair of electrodes). The average numbers of spectral channels that could be distinguished were 5.4 for the basal electrode pair, 8.7 for the midarray electrode pair, and 7.2 for the apical electrode pair. Assuming that the average numbers of spectral channels for these three electrode pairs were representative of the entire 16-contact array, the potential total numbers of spectral channels could be estimated. For the 57 ears, the number of potential channels ranged from 8 to 466, with an average of 93.Conclusions. The HiResolution Bionic Ear has the ability to steer current through simultaneous stimulation of adjacent electrode contacts. These data show that the majority of subjects perceive additional spectral channels other than those associated with stimulation of the fixed electrodes when current steering is implemented. The results suggest that the average cochlear implant user may have significantly more Place-pitch capability than is exploited presently by cochlear implant systems. Current steering will be implemented in a wearable sound-processing strategy that can deliver up to 120 spectral channels to CII and HiRes 90K recipients. The new strategy takes advantage of untapped capabilities of the CII/HiRes 90K implanted electronics and will be implemented through software, with no additional surgery required. It is anticipated that the improved spectral resolution offered by current steering will lead to better speech perception in noise and improved music appreciation.