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Potential factors influencing replay across CA1 during sharp-wave ripples

AuthorsMenéndez de la Prida, Liset
Issue Date2020
CitationPhilosophical transactions of the Royal Society of London. Series B, Biological sciences 375 (2020)
AbstractSharp-wave ripples are complex neurophysiological events recorded along the trisynaptic hippocampal circuit (i.e. from CA3 to CA1 and the subiculum) during slow-wave sleep and awake states. They arise locally but scale brainwide to the hippocampal target regions at cortical and subcortical structures. During these events, neuronal firing sequences are replayed retrospectively or prospectively and in the forward or reverse order as defined by experience. They could reflect either pre-configured firing sequences, learned sequences or an option space to inform subsequent decisions. How can different sequences arise during sharp-wave ripples? Emerging data suggest the hippocampal circuit is organized in different loops across the proximal (close to dentate gyrus) and distal (close to entorhinal cortex) axis. These data also disclose a so-far neglected laminar organization of the hippocampal output during sharp-wave events. Here, I discuss whether by incorporating cell-type-specific mechanisms converging on deep and superficial CA1 sublayers along the proximodistal axis, some novel factors influencing the organization of hippocampal sequences could be unveiled. This article is part of the Theo Murphy meeting issue ‘Memory reactivation: replaying events past, present and future’.
Publisher version (URL)http://dx.doi.org/10.1098/rstb.2019.0236
Identifiersdoi: 10.1098/rstb.2019.0236
issn: 1471-2970
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