长期中等水平的噪音暴露导致中央听觉系统的过度兴奋
Fei Xu1,2, Guangdi Chen1, Li Li1
1Department of Communicative Disorders and Sciences, State University of New York at Buffalo, Buffalo, New York, USA.
Neural plasticity
|February 14, 2025
概括
慢性中等噪音暴露,即使没有听力损伤,也可以增加听力系统的收益. 这种中央收益可能解释了一些人对声音的高度敏感性.
科学领域:
- 神经科学是一个神经科学.
- 审计系统研究 审计系统研究
- 感官感知是一种感官感知.
背景情况:
- 噪音暴露是导致听力损失和超声障的主要原因.
- 现有的模型表明,皮层增益可以弥补耳损伤,但许多超声障患者缺乏可测量的病变.
- 这项研究调查了长期中等噪音暴露后皮层下和皮层神经系统的变化.
研究的目的:
- 为了检查老鼠慢性中等噪音暴露后中央听觉系统的神经变化.
- 为了确定"非破坏性"噪音是否可以在没有显著的耳损伤的情况下诱导中央增益.
- 阐明潜在与中央听觉处理相关的声音敏感度增加背后的机制.
主要方法:
- 实验室小鼠在4周内每天8小时暴露在84dB SPL下.
- 用听觉脑干反应 (ABR) 来评估耳功能.
- 行为听觉敏感性和时间处理通过声学惊反应 (ASR) 和间隙诱导前脉冲抑制 (gap-PPI) 进行了评估.
- 从下侧结核 (IC) 和听觉皮层 (AC) 进行了电生理学记录.
- 使用电流源密度 (CSD) 分析来检查交流响应模式.
主要成果:
- 在暴露于噪音和对照组之间没有观察到ABR值的显著差异.
- 暴露于噪音的小鼠表现出增强的ASR和间隙-PPI,表明听觉灵敏度增加和时间处理改变.
- 在暴露于噪音的小鼠的IC和AC中记录了神经活动的增加,这表明中央收益.
- 交流分析显示,在噪音组中,柱状刺激增加,皮质皮层投射减少.
结论:
- 慢性,中等程度的噪音暴露可以增加中央听觉系统的收益,而不会造成可测量的耳损伤.
- 甲状腺皮层和皮层内输入的变化似乎介导了这种中央增益.
- 这些发现表明,提高声音灵敏度的新机制,甚至在正常听力值的个体中,可能会导致声音过敏.
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