Evidence for Long-Timescale Patterns of Synaptic Inputs in CA1 of Awake Behaving Mice
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Evidence for long-timescale patterns of synaptic inputs in CA1 of awake behaving mice.pdf
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Author(s)
Kolb, Ilya
Wang, Michael
Kodandaramaiah, Suhasa B.
Forest, Craig R.
Singer, Annabelle C.
Talei Franzesi, Giovanni
Boyden, Edward
Date Issued
February 2018
Journal
Journal of Neuroscience
Publisher
Society for Neuroscience
Citation
Kolb, Ilya et al. “Evidence for Long-Timescale Patterns of Synaptic Inputs in CA1 of Awake Behaving Mice.” The Journal of Neuroscience 38, 7 (December 2017): 1821–1834 © 2018 The Authors
Version
Final published version
Abstract
Repeated sequences of neural activity are a pervasive feature of neural networks in vivo and in vitro. In the hippocampus, sequential firing of many neurons over periods of 100-300 ms reoccurs during behavior and during periods of quiescence. However, it is not known whether the hippocampus produces longer sequences of activity or whether such sequences are restricted to specific network states. Furthermore, whether long repeated patterns of activity are transmitted to single cells downstream is unclear. To answer these questions, we recorded intracellularly from hippocampal CA1 of awake, behaving male mice to examine both subthreshold activity and spiking output in single neurons. In eight of nine recordings, we discovered long (900 ms) reoccurring subthreshold fluctuations or “repeats.” Repeats generally were high-amplitude, nonoscillatory events reoccurring with 10msprecision. Using statistical controls, we determined that repeats occurred more often than would be expected from unstructured network activity (e.g., by chance). Most spikes occurred during a repeat, and when a repeat contained a spike, the spike reoccurred with precision on the order of ≤ 20 ms, showing that long repeated patterns of subthreshold activity are strongly connected to spike output. Unexpectedly, we found that repeats occurred independently of classic hippocampal network states like theta oscillations or sharp-wave ripples. Together, these results reveal surprisingly long patterns of repeated activity in the hippocampal network that occur nonstochastically, are transmitted to single downstream neurons, and strongly shape their output. This suggests that the timescale of information transmission in the hippocampal network is much longer than previously thought. Keywords: hippocampus; intracellular activity; subthreshold patterns
MIT Department
Massachusetts Institute of Technology. Media Laboratory
McGovern Institute for Brain Research at MIT
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1523/JNEUROSCI.1519-17.2017
