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Inhibition allocates spikes during hippocampal ripples.

Asako Noguchi1, Roman Huszár2, Shota Morikawa1,3

  • 1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan.

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|March 12, 2022
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Summary

Pre-SWR inhibitory activity in the hippocampus shapes neural sequences. This inhibitory control over pyramidal cell firing diversifies memory replay patterns during sharp-wave ripples (SWRs).

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Neural information processing relies on sequential spike patterns, crucial for memory functions like hippocampal sharp-wave ripples (SWRs).
  • The precise timing of neuronal spikes within sequences is flexible, but the underlying microcircuit mechanisms are not well understood.

Purpose of the Study:

  • To investigate the microcircuit mechanisms controlling flexible spike sequencing in hippocampal CA1 pyramidal cells.
  • To explore the role of inhibitory activity in shaping neural sequences during SWRs.

Main Methods:

  • In vivo recordings of hippocampal CA1 pyramidal cell membrane potentials in mice.
  • Intracellular blockade of chloride-mediated inhibition.
  • Single-unit recordings of inhibitory interneurons.

Main Results:

  • Pyramidal cells exhibited heterogeneous, transient hyperpolarizations before SWRs.
  • Larger pre-SWR hyperpolarizations correlated with later spike timing during SWRs.
  • Inhibition blockade reduced hyperpolarizations and advanced spike times.
  • Pre-SWR inhibitory interneuron firing predicted pyramidal cell spike timing.

Conclusions:

  • Pre-SWR inhibitory activity is a key determinant of sequential spike timing in pyramidal cells.
  • This inhibitory control mechanism enables the diversification of neural sequence patterns during SWRs.