Hippocampal CA1 replay becomes less prominent but more rigid without inputs from medial entorhinal cortex

Alireza Chenani, Marta Sabariego, Magdalene I. Schlesiger, Jill K. Leutgeb, Stefan Leutgeb and Christian Leibold ()
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Alireza Chenani: Ludwig-Maximilians-Universität München
Marta Sabariego: University of California, San Diego
Magdalene I. Schlesiger: University of California, San Diego
Jill K. Leutgeb: University of California, San Diego
Stefan Leutgeb: University of California, San Diego
Christian Leibold: Ludwig-Maximilians-Universität München

Nature Communications, 2019, vol. 10, issue 1, 1-13

Abstract: Abstract The hippocampus is an essential brain area for learning and memory. However, the network mechanisms underlying memory storage, consolidation and retrieval remain incompletely understood. Place cell sequences during theta oscillations are thought to be replayed during non-theta states to support consolidation and route planning. In animals with medial entorhinal cortex (MEC) lesions, the temporal organization of theta-related hippocampal activity is disrupted, which allows us to test whether replay is also compromised. Two different analyses—comparison of co-activation patterns between running and rest epochs and analysis of the recurrence of place cell sequences—reveal that the enhancement of replay by behavior is reduced in MEC-lesioned versus control rats. In contrast, the degree of intrinsic network structure prior and subsequent to behavior remains unaffected by MEC lesions. The MEC-dependent temporal coordination during theta states therefore appears to facilitate behavior-related plasticity, but does not disrupt pre-existing functional connectivity.

Date: 2019
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DOI: 10.1038/s41467-019-09280-0

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