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Optogenetically Blocking Sharp Wave Ripple Events in Sleep Does Not Interfere with the Formation of Stable Spatial Representation in the CA1 Area of the Hippocampus
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Optogenetically Blocking Sharp Wave Ripple Events in Sleep Does Not Interfere with the Formation of Stable Spatial Representation in the CA1 Area of the Hippocampus
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Optogenetically Blocking Sharp Wave Ripple Events in Sleep Does Not Interfere with the Formation of Stable Spatial Representation in the CA1 Area of the Hippocampus
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Journal Article
Optogenetically Blocking Sharp Wave Ripple Events in Sleep Does Not Interfere with the Formation of Stable Spatial Representation in the CA1 Area of the Hippocampus
2016
Overview
During hippocampal sharp wave/ripple (SWR) events, previously occurring, sensory input-driven neuronal firing patterns are replayed. Such replay is thought to be important for plasticity-related processes and consolidation of memory traces. It has previously been shown that the electrical stimulation-induced disruption of SWR events interferes with learning in rodents in different experimental paradigms. On the other hand, the cognitive map theory posits that the plastic changes of the firing of hippocampal place cells constitute the electrophysiological counterpart of the spatial learning, observable at the behavioral level. Therefore, we tested whether intact SWR events occurring during the sleep/rest session after the first exploration of a novel environment are needed for the stabilization of the CA1 code, which process requires plasticity. We found that the newly-formed representation in the CA1 has the same level of stability with optogenetic SWR blockade as with a control manipulation that delivered the same amount of light into the brain. Therefore our results suggest that at least in the case of passive exploratory behavior, SWR-related plasticity is dispensable for the stability of CA1 ensembles.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Archaeal Proteins - genetics
/ Brain
/ Brain Waves - radiation effects
/ CA1 Region, Hippocampal - cytology
/ CA1 Region, Hippocampal - physiology
/ CA1 Region, Hippocampal - radiation effects
/ Exploratory Behavior - physiology
/ Exploratory Behavior - radiation effects
/ Female
/ Medicine and Health Sciences
/ Mice
/ Neuronal Plasticity - genetics
/ Neuronal Plasticity - radiation effects
/ Research and Analysis Methods
/ Rodents
/ Science
/ Sleep
/ Spatial discrimination learning
/ Spatial Learning - physiology
