在双边和单边的耳植入物刺激中,单元时间电极异步和通道相互作用的单元时间电极异步和通道相互作用的影响
Martin J Lindenbeck1, Piotr Majdak1, Bernhard Laback1
1Acoustics Research Institute, Austrian Academy of Sciences, Vienna, Austria.
Trends in hearing
|August 31, 2024
概括
单耳极电极异步 (mTEA) 对耳植入物 (CI) 用户的声音定位线索产生影响. 尽量减少附近电极之间的延迟对于改善CI定时提示编码至关重要.
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
- 信号处理 信号处理
背景情况:
- 与正常听力相比,耳植入物 (CI) 降低了对时间线索的感知,例如耳间时间差异 (ITD).
- 在多电极刺激中的耳道内通道相互作用被怀疑限制了对这些线索的访问.
- 跨电极的刺激时间的单元神经异步可能会调解这些相互作用.
研究的目的:
- 调查单声时间电极异步 (mTEA) 对IC听众基于ITD的左/右歧视的影响.
- 确定电极分离对mTEA效应的影响.
- 将mTEA对双耳ITD歧视的影响与单耳速率-音调歧视进行比较.
主要方法:
- 使用脉冲列车 (100脉冲/秒/电极) 测试了五名CI听众.
- 前向掩盖的空间调曲线测量了ITD的歧视灵敏度.
- 电极分离有所不同,以控制跨电极遮.
主要成果:
- mTEA影响了电极分离<3毫米的ITD区分,显示U/V形图案.
- 这些模式与电气听力中的速率限制效应保持一致.
- 对于距离>7毫米,没有观察到mTEA效应.
结论:
- mTEA在双耳和单耳双电极刺激中起着重要作用.
- 通过通道相互作用介导的单声脉冲率限制是这些效应的基础.
- 建议在未来的CI策略中尽量减少相邻电极之间的刺激延迟,以提高定时提示编码.
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