mPFC spindle cycles organize sparse thalamic activation and recently active CA1 cells during non-REM sleep.

Abstract:

:Sleep oscillations in the neocortex and hippocampus are critical for the integration of new memories into stable generalized representations in neocortex. However, the role of the thalamus in this process is poorly understood. To determine the thalamic contribution to non-REM oscillations (sharp-wave ripples, SWRs; slow/delta; spindles), we recorded units and local field potentials (LFPs) simultaneously in the limbic thalamus, mPFC, and CA1 in rats. We report that the cycles of neocortical spindles provide a key temporal window that coordinates CA1 SWRs with sparse but consistent activation of thalamic units. Thalamic units were phase-locked to delta and spindles in mPFC, and fired at consistent lags with other thalamic units within spindles, while CA1 units that were active during spatial exploration were engaged in SWR-coupled spindles after behavior. The sparse thalamic firing could promote an incremental integration of recently acquired memory traces into neocortical schemas through the interleaved activation of thalamocortical cells.

journal_name

Elife

journal_title

eLife

authors

Varela C,Wilson MA

doi

10.7554/eLife.48881

subject

Has Abstract

pub_date

2020-06-11 00:00:00

issn

2050-084X

pii

48881

journal_volume

9

pub_type

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