Reconciliation of weak pairwise spike-train correlations and highly coherent local field potentials across space.

IF 2.9 2区 医学 Q2 NEUROSCIENCES
Johanna Senk, Espen Hagen, Sacha J van Albada, Markus Diesmann
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引用次数: 0

Abstract

Multi-electrode arrays covering several square millimeters of neural tissue provide simultaneous access to population signals such as extracellular potentials and spiking activity of one hundred or more individual neurons. The interpretation of the recorded data calls for multiscale computational models with corresponding spatial dimensions and signal predictions. Multi-layer spiking neuron network models of local cortical circuits covering about $1\,{\text{mm}^{2}}$ have been developed, integrating experimentally obtained neuron-type-specific connectivity data and reproducing features of observed in-vivo spiking statistics. Local field potentials can be computed from the simulated spiking activity. We here extend a local network and local field potential model to an area of $4\times 4\,{\text{mm}^{2}}$, preserving the neuron density and introducing distance-dependent connection probabilities and conduction delays. We find that the upscaling procedure preserves the overall spiking statistics of the original model and reproduces asynchronous irregular spiking across populations and weak pairwise spike-train correlations in agreement with experimental recordings from sensory cortex. Also compatible with experimental observations, the correlation of local field potential signals is strong and decays over a distance of several hundred micrometers. Enhanced spatial coherence in the low-gamma band around $50\,\text{Hz}$ may explain the recent report of an apparent band-pass filter effect in the spatial reach of the local field potential.

弱成对尖峰-列车相关性与跨空间高度一致的局部场电位的调和。
覆盖几平方毫米神经组织的多电极阵列可同时获取群体信号,如细胞外电位和一百个或更多单个神经元的尖峰活动。要解读记录的数据,就需要建立具有相应空间维度和信号预测的多尺度计算模型。我们开发了覆盖约1,{text{mm}^{2}}$的局部皮层回路的多层尖峰神经元网络模型,整合了实验获得的神经元类型特异性连接数据,并再现了观察到的体内尖峰统计特征。根据模拟的尖峰活动可以计算局部场电位。在此,我们将局部网络和局部场电位模型扩展到4\times 4\,{text{mm}^{2}}$的区域,保留了神经元密度,并引入了与距离相关的连接概率和传导延迟。我们发现,上标过程保留了原始模型的整体尖峰统计,并再现了不同群体间的异步不规则尖峰和弱的成对尖峰-列车相关性,这与感觉皮层的实验记录一致。同样与实验观察结果一致的是,局部场电位信号的相关性很强,并在几百微米的距离内衰减。在50,\text{Hz}$左右的低伽马频带中增强的空间一致性可以解释最近关于局部场电位空间范围中明显的带通滤波器效应的报道。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cerebral cortex
Cerebral cortex 医学-神经科学
CiteScore
6.30
自引率
8.10%
发文量
510
审稿时长
2 months
期刊介绍: Cerebral Cortex publishes papers on the development, organization, plasticity, and function of the cerebral cortex, including the hippocampus. Studies with clear relevance to the cerebral cortex, such as the thalamocortical relationship or cortico-subcortical interactions, are also included. The journal is multidisciplinary and covers the large variety of modern neurobiological and neuropsychological techniques, including anatomy, biochemistry, molecular neurobiology, electrophysiology, behavior, artificial intelligence, and theoretical modeling. In addition to research articles, special features such as brief reviews, book reviews, and commentaries are included.
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