arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1509.01481q-bio.NCcs.CEcs.DC
收藏

神经元细胞外电位计算模型的比较

A Comparison of Computational Models for the Extracellular Potential of Neurons

Jurgis Pods

摘要:

细胞外空间在神经科学中的作用是模糊的。它存在于每一个生理相关的系统中,并经常被用作实验记录中的测量位点,但与细胞内域相比,它受到了次要的关注。在计算建模中,它通常被看作是一个被动的,均匀的电阻介质,具有恒定的电导率,这大大简化了细胞外电位的计算。然而,最近的研究表明,电活性膜的局部离子扩散和电容效应可以对细胞外电位产生实质性影响。这些效应不能用传统的模型来描述,已经受到了理论和实验分析。我们努力给出一个概述,在不同的时间和空间尺度上的浓度和潜在的动力学,特别是对细胞外空间建模的最新进展。三个模型与不同的假设和详细程度进行了比较,无论是理论上和数值模拟:经典的体积导体(VC)模型,这是最常用的线源近似(LSA)的形式;非常详细,但计算密集的泊松-能斯特-普朗克模型的电扩散(PNP);和一个中间的称为电中性模型(EN)。结果清楚地表明,没有一个模型适用于所有应用,因为它们显示出显着不同的响应,特别是接近神经元膜。最后,我们列出了模型模拟的一些常见用例,并给出了在每种情况下使用哪种模型的建议。

英文摘要:

The extracellular space has an ambiguous role in neuroscience. It is present in every physiologically relevant system and often used as a measurement site in experimental recordings, but it has received subordinate attention compared to the intracellular domain. In computational modeling, it is often regarded as a passive, homogeneous resistive medium with a constant conductivity, which greatly simplifies the computation of extracellular potentials. However, recent studies have shown that local ionic diffusion and capacitive effects of electrically active membranes can have a substantial impact on the extracellular potential. These effects can not be described by traditional models, and they have been subject to theoretical and experimental analyses. We strive to give an overview over recent progress in modeling the extracellular space with special regard towards the concentration and potential dynamics on different temporal and spatial scales. Three models with distinct assumptions and levels of detail are compared both theoretically and by means of numerical simulations: the classical volume conductor (VC) model, which is most frequently used in form of the line source approximation (LSA); the very detailed, but computationally intensive Poisson-Nernst-Planck model of electrodiffusion (PNP); and an intermediate one called the electroneutral model (EN). The results clearly show that there is no one model for all applications, as they show significantly different responses especially close to neuronal membranes. Finally, we list some common use cases for model simulations and give recommendations on which model to use in each situation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑