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跨物种的长时间潜伏的听觉唤起反应在生命早期显示了扩展幅度的增加
Krista Lehtomäki1, Jari Keinänen1, Riaz Uddin Mondal2,3
1Center for Interdisciplinary Brain Research & Department of Psychology, Alvar Aallon katu 9, University of Jyväskylä, 40014 Jyväskylä, Finland.
Cerebral cortex (New York, N.Y. : 1991)
|January 7, 2026
概括
孩子 孩子 孩子 孩子
科学领域:
- 神经科学是一个神经科学.
- 发育神经科学的发展神经科学.
- 听觉神经科学 听觉神经科学
背景情况:
- 听觉唤起的反应在童年期间发生了显著的变化,这表明听觉皮层的突触信号修改.
- 在儿童中存在强大的长延迟反应 (N/M250,200-300毫秒),但不是成年人,这表明感官通路的响应性和可塑性增加.
- 整个物种中这种延迟激活模式的发育起源尚未得到充分理解.
研究的目的:
- 为了调查长期潜伏的听觉唤起的反应是否是大脑发育的物种一般特征.
- 为了比较不同年龄组的人类儿童和老鼠的听觉唤起的反应.
主要方法:
- 在人类 (青春期前,青少年,年轻人) 和老鼠中记录了皮层听觉唤起的反应.
- 刺激包括 monaural 弦波音和点击声音.
- 用单一试验分析来评估反应的一致性.
主要成果:
- 在早期反应后,人类和老鼠在听觉皮质中表现出长时间的延迟 (150-450毫秒) 听觉反应.
- 长潜反应的相对幅度在两种物种的年轻个体中都更高.
- 与成人早期反应相比,人类儿童在长延迟窗口中表现出更一致的试验对试验时间.
结论:
- 长延迟的听觉反应似乎是大脑成熟的物种一般标志物,特别是在GABAergic皮质电路中.
- 在被动倾听中观察到的这种反应可能反映了与发育可塑性相关的突触事件.
- 研究结果表明,这种迟反应窗口可以作为听觉皮层发育中的成熟阶段的指标.
相关概念视频
01:13The Cochlea
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.
01:15Auditory Pathway
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 the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:17Auditory Perception
The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...