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. 2019 Mar 12;13:71. doi: 10.3389/fncel.2019.00071

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Copyright © 2019 Langille.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Memory replay during REMS theta shifts phases with increasing memory familiarity. Depicted are theta rhythms, theta replay phases (shown widened and in red) and synapse strengths following theta phase specific reactivations; synapse strength is represented by the size of the postsynapse as well as by the number and phosphorylation (yellow “P”) status of receptors. T0: post-encoding/pre-REMS and starting memory synapse strength; T1: theta peak replay and synapse potentiation; T2: theta limb replay, maintenance phase with no net change of synapse strength; T3: theta trough replay and depotentiation.