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arXiv 1702.00865q-bio.NCcond-mat.dis-nncond-mat.softcond-mat.stat-mech
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预测隐藏神经元如何以及何时扭曲测量的突触相互作用

Predicting how and when hidden neurons skew measured synaptic interactions

Braden A. W. Brinkman, Fred Rieke, Eric Shea-Brown, Michael A. Buice

AI总结:

本研究推导出有效突触相互作用的分解公式,揭示隐藏神经元在强耦合随机网络中重塑观测相互作用的条件,为解释神经数据提供定量工具。

摘要:

理解神经编码和计算的一个主要障碍是,实验记录通常只采样回路中的一小部分神经元。测量的神经特性会因记录神经元与网络“隐藏”部分之间的相互作用而产生偏差。为了正确解释神经数据并确定生物结构如何产生神经回路功能,我们需要更好地理解测量的有效神经特性与真实潜在生理特性之间的关系。在此,我们关注神经元的突触相互作用的有效时空动力学如何通过与未观测神经元的耦合而被重塑。我们发现,从突触前神经元 $r'$ 到突触后神经元 $r$ 的有效相互作用可以分解为从 $r'$ 到 $r$ 的真实相互作用加上从 $r'$ 到 $r$ 经过未观测神经元的每条有向路径的修正项之和。重要的是,所得公式揭示了隐藏单元何时对重塑观测神经元之间的相互作用产生重大影响,以及何时不产生重大影响。作为一个特别值得关注的例子,我们推导了在“强”耦合随机网络中隐藏单元影响的公式——连接权重按 $1/\sqrt{N}$ 缩放,其中 $N$ 是网络规模,这正是近期实验中观察到的缩放。利用这种测量与真实相互作用之间的定量关系,我们可以研究网络属性如何塑造有效相互作用、哪些属性与神经计算相关,以及如何操纵有效相互作用。

英文摘要:

A major obstacle to understanding neural coding and computation is the fact that experimental recordings typically sample only a small fraction of the neurons in a circuit. Measured neural properties are skewed by interactions between recorded neurons and the "hidden" portion of the network. To properly interpret neural data and determine how biological structure gives rise to neural circuit function, we thus need a better understanding of the relationships between measured effective neural properties and the true underlying physiological properties. Here, we focus on how the effective spatiotemporal dynamics of the synaptic interactions between neurons are reshaped by coupling to unobserved neurons. We find that the effective interactions from a pre-synaptic neuron $r'$ to a post-synaptic neuron $r$ can be decomposed into a sum of the true interaction from $r'$ to $r$ plus corrections from every directed path from $r'$ to $r$ through unobserved neurons. Importantly, the resulting formula reveals when the hidden units have---or do not have---major effects on reshaping the interactions among observed neurons. As a particular example of interest, we derive a formula for the impact of hidden units in random networks with "strong" coupling---connection weights that scale with $1/\sqrt{N}$, where $N$ is the network size, precisely the scaling observed in recent experiments. With this quantitative relationship between measured and true interactions, we can study how network properties shape effective interactions, which properties are relevant for neural computations, and how to manipulate effective interactions.

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。

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