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首页> 外文期刊>Journal of the Association for Research in Otolaryngology: JARO >Is there a fundamental 300 HZ limit to pulse rate discrimination in cochlear implants?
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Is there a fundamental 300 HZ limit to pulse rate discrimination in cochlear implants?

机译：耳蜗植入物中的脉率识别是否有300 HZ的基本限制？

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Literature often refers to a 300 pps limit for cochlear implant (CI) electrical stimulation, above which pulse rate discrimination deteriorates or above which rate pitch is not perceived to increase. The present study investigated the effect on pulse rate difference limens (PRDLs) when using compound stimuli in which identical pulse trains were applied to multiple electrodes across the length of the electrode array and compared the results to those of single-electrode stimuli. PRDLs of seven CI users were determined in two stimulus pulse phase conditions, one in which the phase delays between pulses on different electrodes were minimised (burst mode) and a second in which they were maximised (spread mode). PRDLs were measured at base rates of 100 to 600 pps in 100 pps intervals, using compound stimuli on one, two, five, nine and 18 electrodes. As smaller PRDLs were expected to reflect improved rate pitch perception, 18-electrode spread mode stimuli were also included in a pitch ranking task. PRDLs improved markedly when multi-electrode compound stimuli were used, with average spread mode PRDLs across listeners between 6 and 8 % of the base rate in the whole range tested (i.e. up to 600 pps). PRDLs continued to improve as more electrodes were included, up to at least nine electrodes in the compound stimulus. Stimulus pulse phase had a significant influence on the results, with PRDLs being smaller in spread mode. Results indicate that pulse rate discrimination may be manipulated with stimulus parameter choice so that previously observed deterioration of PRDLs at 300 pps probably does not reflect a fundamental limitation to rate discrimination. However, rate pitch perception did not improve in the conditions that resulted in smaller PRDLs. This may indicate that listeners used cues other than pitch to perform the rate discrimination task or may reflect limitations in the electrically evoked neural excitation patterns presented to a rate pitch extraction mechanism.
机译：文献经常提到耳蜗植入（CI）电刺激的300 pps极限，在该极限之上，脉搏频率辨别力恶化，或在其之上，脉搏音高不被认为增加。本研究调查了在使用复合刺激时对脉冲速率差异石灰（PRDL）的影响，在复合刺激中，在整个电极阵列的长度上将相同的脉冲序列应用于多个电极，并将结果与​​单电极刺激进行了比较。在两种刺激脉冲相位条件下确定了七个CI用户的PRDL，一种是在不同电极上的脉冲之间的相位延迟最小（突发模式），另一种是在它们之间最大化（扩展模式）。在一个，两个，五个，九个和18个电极上使用复合刺激物，以100 pps的间隔以100到600 pps的基本速率测量PRDL。由于期望较小的PRDL反映出改善的速率音高感知，所以在音高排名任务中还包括18电极扩展模式刺激。当使用多电极复合刺激物时，PRDL显着改善，在整个测试范围内（即最高600 pps），跨听众的平均扩散模式PRDL在基本速率的6％至8％之间。随着包含更多电极，PRDLs持续改善，在复合刺激物中至少有九个电极。刺激脉冲相位对结果有重大影响，在扩展模式下PRDL较小。结果表明，可以通过刺激参数的选择来操纵脉搏频率的辨别力，从而使先前观察到的300 pps的PRDLs恶化可能并不反映出对频率辨别力的基本限制。但是，在导致较小PRDL的条件下，速率音调感知没有改善。这可能表明听众使用了除音调以外的其他线索来执行速率区分任务，或者可能反映了呈现给速率音调提取机制的电诱发神经激励模式的局限性。

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