Theta Band Zero-Lag Long-Range Cortical Synchronization via Hippocampal Dynamical Relaying
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Growing evidence suggests that synchronization among distributed neuronal networks underlie functional integration in the brain. Neural synchronization is typically revealed by a consistent phase delay between neural responses generated in two separated sources. But the influence of a third neuronal assembly in that synchrony pattern remains largely unexplored. We investigate here the potential role of the hippocampus in determining cortico-cortical theta synchronization in different behavioral states during motor quiescent and while animals actively explore the environment. To achieve this goal, the two states were modeled with a recurrent network involving the hippocampus, as a relay element, and two distant neocortical sites. We found that cortico-cortical neural coupling accompanied higher hippocampal theta oscillations in both behavioral states, although the highest level of synchronization between cortical regions emerged during motor exploration. Local field potentials recorded from the same brain regions qualitatively confirm these findings in the two behavioral states. These results suggest that zero-lag long-range cortico-cortical synchronization is likely mediated by hippocampal theta oscillations in lower mammals as a function of cognitive demands and motor acts.
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GOLLO, Leonardo L., Claudio R. MIRASSO, Mercedes ATIENZA, Maité CRESPO-GARCÍA, Jose L. CANTERO, 2011. Theta Band Zero-Lag Long-Range Cortical Synchronization via Hippocampal Dynamical Relaying. In: PLoS ONE. 2011, 6(3), e17756. eISSN 1932-6203. Available under: doi: 10.1371/journal.pone.0017756BibTex
@article{Gollo2011-03-08Theta-35139,
year={2011},
doi={10.1371/journal.pone.0017756},
title={Theta Band Zero-Lag Long-Range Cortical Synchronization via Hippocampal Dynamical Relaying},
number={3},
volume={6},
journal={PLoS ONE},
author={Gollo, Leonardo L. and Mirasso, Claudio R. and Atienza, Mercedes and Crespo-García, Maité and Cantero, Jose L.},
note={Article Number: e17756}
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<dcterms:abstract xml:lang="eng">Growing evidence suggests that synchronization among distributed neuronal networks underlie functional integration in the brain. Neural synchronization is typically revealed by a consistent phase delay between neural responses generated in two separated sources. But the influence of a third neuronal assembly in that synchrony pattern remains largely unexplored. We investigate here the potential role of the hippocampus in determining cortico-cortical theta synchronization in different behavioral states during motor quiescent and while animals actively explore the environment. To achieve this goal, the two states were modeled with a recurrent network involving the hippocampus, as a relay element, and two distant neocortical sites. We found that cortico-cortical neural coupling accompanied higher hippocampal theta oscillations in both behavioral states, although the highest level of synchronization between cortical regions emerged during motor exploration. Local field potentials recorded from the same brain regions qualitatively confirm these findings in the two behavioral states. These results suggest that zero-lag long-range cortico-cortical synchronization is likely mediated by hippocampal theta oscillations in lower mammals as a function of cognitive demands and motor acts.</dcterms:abstract>
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