Projections of Cochlear Nucleus Axons

这项研究旨在了解耳蜗核中的神经细胞是如何处理和编码听觉信息的，耳蜗核是参与听力的大脑通路的一部分。听觉环境提供了来自不同来源的无数声音的丰富而复杂的信息阵列。其中一些信息，如语音，与我们高度相关，而大部分信息被忽视为无关的噪音。听觉中枢神经系统将听觉信息转换成神经信号，然后在大脑的不同层面进行分析。为了了解听觉信息处理是如何发生的，这项研究正在进行，以确定耳蜗核中个别类型的神经细胞对听觉信息的哪些方面进行编码，以及耳蜗神经元在大脑中将这些信息发送到哪里。使用插入单个神经元的微电极记录和分析单个神经细胞的活动，记录对听觉刺激的反应，并将染料注入神经细胞，以便使用组织学技术进行识别。通过使用光学和电子显微镜来定位和分析该标记的神经元，有可能回答一些基本的问题，包括：(1)某些类型的细胞编码听觉信号的特定部分吗？(2)这些细胞将信息传递给大脑的哪个部分？(3)不同类型的神经元之间有什么相互作用？这些研究对于理解如此复杂的感觉系统如何为我们提供对感知和认知体验如此关键的听觉体验至关重要。

This research is directed towards understanding how auditory information is processed and coded by nerve cells in the cochlear nucleus, a portion of the brain pathways that are involved in hearing. The auditory environment provides a rich and complex array of information from a myriad of sounds from different sources. Some of this information, such as speech sounds, is highly relevant to us, while much of it is disregarded as extraneous noise. The auditory central nervous system converts auditory information into neural signals which are later analyzed at different levels in the brain. In order to understand how auditory information processing occurs, this research is being conducted to determine what aspects of auditory information are being coded by individual types of nerve cells in the cochlear nucleus as well as where cochlear neurons send this information in the brain. The activity of single nerve cells is recorded and analyzed using microelectrodes inserted into single neurons, the response to auditory stimulation is recorded, and a dye is injected into the nerve cell in order to identify it using histological techniques. By locating and analyzing this labelled neuron using both light and electron microscopy, it is possible to answer a number of basic questions which include: (1) Do certain types of cells encode specific parts of the auditory signal? (2) What part of the brain do these cells relay information to? (3) What are the interactions between individual types of neurons? These studies are essential to understanding how such a complex sensory system provides us with the experience of hearing that is so crucial to perception and cognitive experience.