在微型结构和外中,对声区间时间差异线索的速率依赖的神经反应
Hongmei Hu1,2, Stephan D Ewert2, Birger Kollmeier2
1SOUND Lab, Cambridge Hearing Group, Department of Clinical Neuroscience, Cambridge University, Cambridge, United Kingdom.
PeerJ
|April 29, 2024
概括
这项研究研究了耳植入物 (CI) 脉冲率如何使用电脑电图 (EEG) 影响耳间时间差 (ITD) 灵敏度. 结果显示,较高的脉冲率降低了ITD感知,影响了双边CI用户的空间听力.
科学领域:
- 听觉神经科学 听觉神经科学
- 神经科学是一个神经科学.
- 生物医学工程 生物医学工程
背景情况:
- 双边耳植入物 (CI) 用户由于信号处理和外科手术的限制,往往缺乏双耳听力益处.
- 间声时间差 (ITD) 灵敏度,对于空间听力至关重要,依赖于时间细结构,大多数CI没有传递.
- 目前的双边CI使用者比正常听力的人表现出较差的ITD灵敏度,特别是在每秒300脉冲以上的刺激速率下.
研究的目的:
- 开发电脑电图 (EEG) 范式,用于评估和优化双边CI用户在临床环境中的ITD提示传递.
- 为了确定CI刺激脉冲率对ITD灵敏度的影响.
- 通过使用EEG测量来描述ITD感知的速度依赖性退化.
主要方法:
- 从正常听觉的听众身上记录了EEG响应,使用正弦振幅调制 (SAM) 音调和过的点击.
- 刺激在细结构ITD (ITDFS) 和包裹ITD (ITDENV) 中有所不同.
- 分析了听觉稳定状态反应 (ASSR) 和皮质听觉唤起潜能 (CAEP),包括声学变化复合体 (ACC) 反应.
主要成果:
- 与ITDFS变化相比,ACC对ITDENV变化的反应较小或不存在.
- ACC形态类似于开始/抵消CAEP,ACC的延迟时间最长,偏移CAEP的延迟时间最短.
- 较高的载波频率减少了皮质下ASSR;过的点击产生了比高频SAM音调更大的ASSR.
结论:
- 在听觉处理中,EEG测量可以描述依赖于速度的ITD感知恶化.
- 结果表明,在双边CI用户中优化ITD提示传递策略的潜力,以改善空间听力.
- 使用EEG范式的进一步研究可以帮助开发更好的CI信号处理,以增强听觉体验.
相关概念视频
01:13The Cochlea
44.8K
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
44.8K
01:21Perceiving Loudness, Pitch, and Location
208
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
208
01:31Hearing
52.1K
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
52.1K