脉冲形状对耳植入物使用者的音调灵敏度的影响
1Program of Speech and Hearing Science, College of Health Solutions, Arizona State University, 975 S. Myrtle Av., Tempe, AZ 85287, USA.
Hearing research
|July 10, 2024
概括
阳极中心的三相 (A-TP) 脉冲可以通过提高位置音调灵敏度来增强耳植入物 (CIs) 中的光谱编码. 这一发现对于有听觉神经退化症的CI使用者来说尤其重要.
科学领域:
- 听觉神经科学 听觉神经科学
- 生物医学工程 生物医学工程
- 语音处理 语音处理
背景情况:
- 耳植入物 (CIs) 使用电刺激,通常是带有阴极导向的对称双相 (C-BP) 脉冲.
- 不对称脉冲形状在CI中对光谱和时间编码的潜在好处尚未完全理解.
研究的目的:
- 为了研究不同脉冲形状对耳植入物使用者的位置和时间调度灵敏度的影响.
- 为了比较C-BP,阳极中心三相 (A-TP) 和阴极中心三相 (C-TP) 脉冲列车的功效.
主要方法:
- 使用虚拟频道排名 (VCR) 门测试的位置音调灵敏度和使用振幅调制频率排名 (AMFR) 门测试的时间音调灵敏度.
- 刺激包括C-BP,A-TP和C-TP脉冲列车,通过顶,中间和基底电极的单极刺激传递.
- 实验是在低 (每秒99脉冲) 和高 (每秒1000脉冲) 脉冲率进行的.
主要成果:
- 在更基本的电极位置观察到更高的检测值,最舒适的水平 (MCL),VCR和AMFR值.
- 由于活性阶段持续时间较长,C-BP脉冲的检测值和MCL较低.
- 与C-BP和C-TP相比,A-TP脉冲在每秒1000脉冲的视频录像机值得到了改善,这表明位置音调灵敏度增强,特别是在听觉神经退化时.
结论:
- 阳极中心的三相 (A-TP) 脉冲刺激可能通过提高位置调度灵敏度,为耳植入物中的光谱编码提供优势.
- 在听觉神经外周过程退化的情况下,A-TP脉冲的益处显得更加明显.
- 对不对称脉冲形状的进一步研究可以优化耳植入物的性能,以改善语音感知.
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