Progress and issues in second-order analysis of hippocampal replay

Progress and issues in second-order analysis of hippocampal replay
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海马回放二阶分析的进展与问题

DOI:
10.1098/rstb.2019.0238
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发表时间:
2020
期刊:
Philosophical Transactions of the Royal Society B: Biological Sciences
影响因子:
--
通讯作者:
Diba, Kamran
Diba, Kamran
中科院分区:
--
文献类型:
--
作者:
van der Meer, Matthijs A.;Kemere, Caleb;Diba, Kamran

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在海马体中发生的锐波涟漪(SWR)事件期间自发发生的神经活动模式被认为在记忆形成、巩固和提取中起重要作用。典型的研究探讨的内容,SWRs寻求确定是否身份和/或时间顺序的细胞放电是不同的机会。这种“一阶”分析集中在一个单一的时间点和模板(地图),并已被用来显示,例如,存在的预演。一阶分析的主要方法挑战是不同机会分布的构建和解释。相比之下,“二阶”分析涉及不同时间点之间和/或不同模板之间的SWR内容的比较。典型的二阶问题包括经验依赖性测试(重放),比较体验前后的SWR内容,以及迷宫不同分支之间的比较或重放。此类问题带来了额外的方法学挑战,可能会导致结果和相关解释的偏差。我们提供了一个清单的分析挑战的二阶问题的SWR的内容,并建议如何防止,识别和解决可能的分析偏见。考虑到在更复杂的实验场景和不同的时间尺度上理解SWR内容的兴趣不断发展,我们预计这些问题将变得越来越普遍。本文是Theo Murphy会议问题“记忆重新激活:重放过去,现在和未来的事件”的一部分。
Patterns of neural activity that occur spontaneously during sharp-wave ripple (SWR) events in the hippocampus are thought to play an important role in memory formation, consolidation and retrieval. Typical studies examining the content of SWRs seek to determine whether the identity and/or temporal order of cell firing is different from chance. Such ‘first-order’ analyses are focused on a single time point and template (map), and have been used to show, for instance, the existence of preplay. The major methodological challenge in first-order analyses is the construction and interpretation of different chance distributions. By contrast, ‘second-order’ analyses involve a comparison of SWR content between different time points, and/or between different templates. Typical second-order questions include tests of experience-dependence (replay) that compare SWR content before and after experience, and comparisons or replay between different arms of a maze. Such questions entail additional methodological challenges that can lead to biases in results and associated interpretations. We provide an inventory of analysis challenges for second-order questions about SWR content, and suggest ways of preventing, identifying and addressing possible analysis biases. Given evolving interest in understanding SWR content in more complex experimental scenarios and across different time scales, we expect these issues to become increasingly pervasive.This article is part of the Theo Murphy meeting issue ‘Memory reactivation: replaying events past, present and future’.
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