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Nat Neurosci. 2007 Oct;10(10):1241-2. Epub 2007 Sep 2.

Forward and reverse hippocampal place-cell sequences during ripples.

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  • 1Center for Molecular and Behavioral Neurobiology, Rutgers University, 197 University Ave, Newark, New Jersey 07102, USA. diba@andromeda.rutgers.edu

Abstract

We report that temporal spike sequences from hippocampal place neurons of rats on an elevated track recurred in reverse order at the end of a run, but in forward order in anticipation of the run, coinciding with sharp waves. Vector distances between the place fields were reflected in the temporal structure of these sequences. This bidirectional re-enactment of temporal sequences may contribute to the establishment of higher-order associations in episodic memory.

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