Pulse rate discrimination with deeply inserted electrode arrays
Pulse rate discrimination with deeply inserted electrode arrays
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DOI：
10.1016/j.heares.2004.06.008
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发表时间：
2004-10-01
期刊：
影响因子：
2.8
通讯作者：
Nobbe, A
中科院分区：
文献类型：
--
作者：
Baumann, U;Nobbe, A
对植入 MED-EL COMBI 40+ 植入物的 7 名（AMDL 为 3 名）受试者的脉率差值 (PRDL) 和调幅差值 (AMDL) 作为基础心率和耳蜗电极位置的函数进行评估。 MEDEL COMBI 40+ 电极阵列允许将电极深度插入耳蜗顶端，以最大程度地减少脉冲速率低于 500 pps 时的速率/位置不匹配。使用三个间隔、两个可选择的带有反馈的强制选择程序来测量差异阈值。基本费率在 200 到 800 pps 之间。 AMDL 测量的携带率为 5081 pps。 PRDL 随着基础脉率的增加而增加。在 200 pps 时，在心尖电极处测得的平均 PRDL 达到 48.7 pps，在 400 pps 时，平均 PRDL 达到 206.6 pps。从顶端或基底电极获得的 PRDL 之间没有观察到显着差异。在所有测试的基本利率下，AMDL 均高于 PRDL。区分利率变化的能力仅限于最高约 283 个百分点的基本利率。结果表明，小于三分之一的速率变化不会在电听力中引起可区分的听觉感知。顶端和基底电极位置之间不存在差异表明速率/位置失配的减少并不能提高辨别性能。 (C) 2004 Elsevier B.V. 保留所有权利。
Pulse rate difference limen (PRDL) and amplitude modulation difference limen (AMDL) were assessed as a function of base rate and cochlear electrode location in seven (three for AMDL) subjects implanted with the MED-EL COMBI 40+ implant. The MEDEL COMBI 40+ electrode array allows deep insertion of the electrode up to the apex of the cochlea to minimize the rate/place mismatch for pulse rates below 500 pps. A three interval, two alternative forced-choice procedure with feedback was used to measure the difference limen. The base rate was in the range between 200 and 800 pps. The carrier rate for the AMDL measurement was 5081 pps. The PRDL increased with increasing base pulse rate. At 200 pps the average PRDL measured at the apical electrode amounted to 48.7 pps, at 400 pps the average PRDL reached 206.6 pps. No significant difference between PRDL obtained from apical or basal electrodes could be observed. AMDL was higher than PRDL at all tested base rates. The ability to discriminate rate changes is limited to base rates up to about 283 pps. The results indicate that rate changes smaller than a major third do not elicit distinguishable auditory perceptions in electrical hearing. The absence of a difference between apical and basal electrode locations indicates that a reduction of the rate/place mismatch does not improve discrimination performance. (C) 2004 Elsevier B.V. All rights reserved.