A Fast Method for Measuring Psychophysical Thresholds Across the Cochlear Implant Array
A Fast Method for Measuring Psychophysical Thresholds Across the Cochlear Implant Array
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DOI：
10.1177/2331216515569792
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发表时间：
2015-02-04
影响因子：
2.7
通讯作者：
Oxenham, Andrew J.
中科院分区：
文献类型：
--
作者：
Bierer, Julie A.;Bierer, Steven M.;Oxenham, Andrew J.
提出了一种基于Bekesy跟踪的快速阈值测量方法，并对该方法用于人工耳蜗植入（CI）进行了评价。十五postlingually熟练的成年CI用户参与。绝对阈值为200毫秒列车的双相脉冲测量使用新的跟踪程序，并与传统的强制选择的自适应程序单极和四极刺激下获得的阈值进行了比较。在跟踪过程中，通过电流引导实现了跨电极阵列的虚拟光谱扫描，电流引导将电流在两个相邻电极之间分配，并改变引导至每个电极的电流的比例。总体而言，使用新信道扫描程序的阈值估计与使用自适应强制选择程序的估计之间没有发现系统差异。从扫描程序的阈值的重测信度略差于阈值从强迫选择程序。然而，对于相同的重复次数，新方法的速度约为4倍。总的来说，新跟踪程序的可靠性和速度使其具有在临床环境中估计阈值的潜力。用于估计阈值的快速方法与导致电极之间的较大阈值变化的聚焦刺激技术相结合可能具有特别的临床重要性。
A rapid threshold measurement procedure, based on Bekesy tracking, is proposed and evaluated for use with cochlear implants (CIs). Fifteen postlingually deafened adult CI users participated. Absolute thresholds for 200-ms trains of biphasic pulses were measured using the new tracking procedure and were compared with thresholds obtained with a traditional forced-choice adaptive procedure under both monopolar and quadrupolar stimulation. Virtual spectral sweeps across the electrode array were implemented in the tracking procedure via current steering, which divides the current between two adjacent electrodes and varies the proportion of current directed to each electrode. Overall, no systematic differences were found between threshold estimates with the new channel sweep procedure and estimates using the adaptive forced-choice procedure. Test-retest reliability for the thresholds from the sweep procedure was somewhat poorer than for thresholds from the forced-choice procedure. However, the new method was about 4 times faster for the same number of repetitions. Overall the reliability and speed of the new tracking procedure provides it with the potential to estimate thresholds in a clinical setting. Rapid methods for estimating thresholds could be of particular clinical importance in combination with focused stimulation techniques that result in larger threshold variations between electrodes.