Electro-Acoustic Stimulation Acoustic and Electric Pitch Comparisons
Electro-Acoustic Stimulation Acoustic and Electric Pitch Comparisons
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DOI：
10.1159/000206489
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发表时间：
2009-01-01
影响因子：
1.6
通讯作者：
Simpson, Andrea
中科院分区：
文献类型：
--
作者：
McDermott, Hugh;Sucher, Catherine;Simpson, Andrea
为了使同时的声刺激和电刺激被感知为互补的，可以有益于助听器和耳蜗植入物（CI）被调整以提供兼容的音高感觉。为此，从14个CI用户谁有可用的低频听力，无论是在非植入耳朵或在双耳的听觉的一组声学和电刺激的音高感知的估计。受试者分别对5个纯音和5个单电极电脉冲序列进行数字音高估计。平均而言，在音高上对应于最顶端电极上的刺激的声频约为480 Hz。这比应用于基于X射线图像的电极插入角度估计的Greenwood频率-位置函数的预期频率低约1个倍频程。此外，有证据表明，音调下降的CI使用时间的增加。音高估计从5名受试者谁完成了实验之前经历任何其他声音通过他们的CI一般接近预期的值从最近公布的耳蜗螺旋神经节的频率图。总之，这些发现表明，可能会发生一些感知适应，这将部分补偿电极的脑内位置和声音处理器中分配给它们的声频之间的明显失配。版权所有（C）2009 S. Karger AG，巴塞尔
For simultaneous acoustic and electric stimulation to be perceived as complementary, it may be beneficial for hearing aids and cochlear implants (CI) to be adjusted to provide compatible pitch sensations. To this end, estimates of the pitch perceived for a set of acoustic and electric stimuli were obtained from 14 CI users who had usable low-frequency hearing, either in the non-implanted ear or in both ears. The subjects assigned numerical pitch estimates to each of 5 acoustic pure tones and 5 single-electrode electric pulse trains. On average, the acoustic frequency that corresponded in pitch to stimulation on the most apical electrode was approximately 480 Hz. This was about 1 octave lower than the frequency expected from Greenwood's frequency-place function applied to estimates of the electrode insertion angle based on X-ray images. Furthermore, evidence was found suggesting that pitch decreased with increasing duration of CI use. Pitch estimates from 5 subjects who completed the experiment before experiencing any other sounds through their CI were generally close to the values expected from a recently published frequency map for the cochlear spiral ganglion. Taken together, these findings suggest that some perceptual adaptation may occur that would compensate in part for the apparent mismatch between the intracochlear position of the electrodes and the acoustic frequencies assigned to them in the sound processor. Copyright (C) 2009 S. Karger AG, Basel