急性和慢性噪音创伤对通过主要听觉皮层的刺激唤起的活动的影响
Vinay Parameshwarappa1, Arnaud J Norena1
1Centre National de la Recherche Scientifique, Aix-Marseille University, Marseille, France.
Journal of neurophysiology
|January 10, 2024
概括
噪音创伤增强了听觉皮层的活动,特别是在supragranular层,这可能解释了超声障. 这项研究揭示了噪音暴露后皮质处理的改变.
科学领域:
- 神经科学是一个神经科学.
- 听觉神经科学 听觉神经科学
- 感官处理 感官处理
背景情况:
- 暴露于噪音会导致听力损失和听力障碍,如耳和声.
- 之前的研究集中在颗粒层上,忽视了听觉皮层复杂的层状结构.
- 听觉感知障碍的核心起源需要了解皮质变化.
研究的目的:
- 研究噪音创伤对听觉皮层活动层状模式的影响.
- 检查急性和慢性噪音创伤对刺激引起的反应的影响.
- 确定局部场势 (LFP) 幅度和电流源密度的变化.
主要方法:
- 在听力皮层研究中利用了麻醉的试验猪模型.
- 应用了急性和慢性噪音创伤协议.
- 分析了刺激唤起的活动,LFP振幅,以及穿过皮层的电流源密度.
主要成果:
- 无论是急性还是慢性噪音创伤,都会增加刺激引起的皮质反应,主要是在颗粒和超颗粒层.
- 皮层反应变得更加单调,随着创伤后强度的增加.
- 慢性噪音创伤,比急性更严重,导致LFP振幅增强,并导致超细粒层的新沉,表明输入处理发生了变化.
结论:
- 噪音创伤显著改变听觉皮层活动模式,增强反应,并将输入处理转移到超细粒层.
- 这些层状变化可能是噪音创伤后观察到的听觉过敏 (声音过敏) 的基础.
- 该研究强调了考虑整个皮质层状结构对于理解噪音引起的听力缺陷的重要性.
相关概念视频
Auditory Pathway
5.4K
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
5.4K
Hearing
52.3K
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.
52.3K


