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

K. Kovács, J. O’Neill, P. Schönenberger, M. Penttonen, D.K. Rangel Guerrero, J.L. Csicsvari, PLoS One 11 (2016).

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Journal Article | Published | English
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Abstract
During hippocampal sharp wave/ripple (SWR) events, previously occurring, sensory inputdriven 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.
Publishing Year
Date Published
2016-10-19
Journal Title
PLoS One
Acknowledgement
The research leading to these results has received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement n° [291734] via the IST FELLOWSHIP awarded to Dr. Krisztián A. Kovács and the European Research Council starting grant (acronym: HIPECMEM Project reference: 281511) awarded to Dr. Jozsef Csicsvari. We thank Lauri Viljanto for technical help in building the ripple detector.
Volume
11
Issue
10
Article Number
e0164675
IST-REx-ID

Cite this

Kovács K, O’Neill J, Schönenberger P, Penttonen M, Rangel Guerrero DK, Csicsvari JL. 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. PLoS One. 2016;11(10). doi:10.1371/journal.pone.0164675
Kovács, K., O’Neill, J., Schönenberger, P., Penttonen, M., Rangel Guerrero, D. K., & Csicsvari, J. L. (2016). 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. PLoS One, 11(10). https://doi.org/10.1371/journal.pone.0164675
Kovács, Krisztián, Joseph O’Neill, Philipp Schönenberger, Markku Penttonen, Dámaris K Rangel Guerrero, and Jozsef L Csicsvari. “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.” PLoS One 11, no. 10 (2016). https://doi.org/10.1371/journal.pone.0164675.
K. Kovács, J. O’Neill, P. Schönenberger, M. Penttonen, D. K. Rangel Guerrero, and J. L. Csicsvari, “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,” PLoS One, vol. 11, no. 10, 2016.
Kovács K, O’Neill J, Schönenberger P, Penttonen M, Rangel Guerrero DK, Csicsvari JL. 2016. 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. PLoS One. 11(10).
Kovács, Krisztián, et al. “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.” PLoS One, vol. 11, no. 10, e0164675, Public Library of Science, 2016, doi:10.1371/journal.pone.0164675.
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