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Activity-dependent plasticity of hippocampal place maps

Schoenenberger, Philipp, O'Neill, Joseph and Csicsvari, Jozsef 2016. Activity-dependent plasticity of hippocampal place maps. Nature Communications 7 , 11824. 10.1038/ncomms11824

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Hippocampal neurons encode a cognitive map of space. These maps are thought to be updated during learning and in response to changes in the environment through activity-dependent synaptic plasticity. Here we examine how changes in activity influence spatial coding in rats using halorhodopsin-mediated, spatially selective optogenetic silencing. Halorhoposin stimulation leads to light-induced suppression in many place cells and interneurons; some place cells increase their firing through disinhibition, whereas some show no effect. We find that place fields of the unaffected subpopulation remain stable. On the other hand, place fields of suppressed place cells were unstable, showing remapping across sessions before and after optogenetic inhibition. Disinhibited place cells had stable maps but sustained an elevated firing rate. These findings suggest that place representation in the hippocampus is constantly governed by activity-dependent processes, and that disinhibition may provide a mechanism for rate remapping

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License.
Publisher: Nature Research
ISSN: 2041-1723
Date of First Compliant Deposit: 31 January 2018
Date of Acceptance: 4 May 2016
Last Modified: 15 Oct 2020 11:15

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