The Consolidation and Transformation of Memory

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The Consolidation and Transformation of Memory Yadin Dudai, Avi Karni, Jan Born Neuron Volume 88, Issue 1, Pages 20-32 (October 2015) DOI: 10.1016/j.neuron.2015.09.004 Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 1 A Heuristic, Simplified Block Model of Selected Phases in Episodic Memory Consolidation (A) The initiation of consolidation. Activation of a hypothetical encoding set precedes the event to be encoded, which is registered on the fly in the hippocampal system, involving rapid alternations of encoding mode (of the new information) and retrieval mode (of familiar attributes of the experience). An automatic episodic buffer, which also suberves working memory related to the ongoing task, is assumed to bind the incoming information into a coherent representation, the closure of which by a postulated event boundary sets into action the consolidation cascade. (B) Consolidation during sleep. The episodic experiences (x,y,z) loading into the hippocampal-based buffer is accompanied by EEG theta activity and tagging of memories for reactivation during succeeding sleep. Reactivations that repeatedly occur during slow wave sleep stimulate the passage of the reactivated memory information toward neocortical storage sites where this memory information becomes integrated into pre-existing knowledge networks. Ensuing REM sleep stabilizes the newly formed neocortical representations via synaptic consolidation and might simultaneously degrade and disintegrate (large parts of) the hippocampal representation. For further details see text. Hipp, the hippocampal formation functioning in concert with parahippocampal cortici; IdAI, left dorsal anterior insula; MTL, mediotemporal lobe; NC, neocortex; PC, parietal cortex; PFC, prefrontal cortex, SWS, slow wave sleep. For further details see text. Neuron 2015 88, 20-32DOI: (10.1016/j.neuron.2015.09.004) Copyright © 2015 Elsevier Inc. Terms and Conditions