Cited by 1,015Neural dynamics and brain functionMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Entrainment of Neocortical Neurons and Gamma Oscillations by the Hippocampal Theta Rhythm

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Sirota, Anton, Montgomery, Sean, Fujisawa, Shigeyoshi, Isomura, Yoshikazu, Zugaro, Michael, Buzsáki, György·2008·Neuron

Abstract

Although it has been tacitly assumed that the hippocampus exerts an influence on neocortical networks, the mechanisms of this process are not well understood. We examined whether and how hippocampal theta oscillations affect neocortical assembly patterns by recording populations of single cells and transient gamma oscillations in multiple cortical regions, including the somatosensory area and prefrontal cortex in behaving rats and mice. Laminar analysis of neocortical gamma bursts revealed multiple gamma oscillators of varying frequency and location, which were spatially confined and synchronized local groups of neurons. A significant fraction of putative pyramidal cells and interneurons as well as localized gamma oscillations in all recorded neocortical areas were phase biased by the hippocampal theta rhythm. We hypothesize that temporal coordination of neocortical gamma oscillators by hippocampal theta is a mechanism by which information contained in spatially widespread neocortical assemblies can be synchronously transferred to the associative networks of the hippocampus.

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Crossref · 10.1016/j.neuron.2008.09.014

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  • Theta waves are maintained, probably by an external input, while local gamma oscillations reduce their presence by a putative imbalance of excitatory-inhibitory activity as a consequence of the loss of perisomatic synapses on PV cells.

    “Based on these results, we hypothesize that u waves are maintained, probably by an external input (Siapas et al., 2005;Sirota et al., 2008), while the local g oscillations reduce their presence by a putative imbalance of the excitatory-inhibitory activity as a consequence of the loss of perisomatic synapses on PV cells.”
  • Theta activities in hippocampus and limbic circuits may be distantly projected to neocortical areas.

    “Further, theta activities in hippocampus and limbic circuits of the brain may be distantly projected to neocortical areas as well (Sirota et al., 2008).”

    From Brain oscillations, hypnosis, and hypnotizability (2015) · cites this paper as Sirota et al., 2008

  • The hippocampal theta rhythm entrains single-unit activity in both pyramidal cells and interneurons of the PFC, as well as PFC gamma-band activity (40-120 Hz).

    “This hippocampal theta rhythm has been shown to entrain single-unit activity in both pyramidal cells and interneurons of the PFC, as well as PFC gamma-band activity (40–120 Hz)132.”

    From Resolving the neural circuits of anxiety (2015) · cites this paper as [132]

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Research works printed but not linked: 1

  1. Miller R 1991 Cortico-hippocampal interplay Springer-Verlag New York

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Authors
Sirota, A., Montgomery, S., Fujisawa, S., Isomura, Y., Zugaro, M., & Buzsáki, G.
Affiliations
Rutgers, The State University of New Jersey (US)
Corresponding author
Buzsáki, György
Venue
Neuron
Publisher
Elsevier BV
Published
2008-11
Volume
60
Issue
4
Pages
683-697
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2030345583
Cited by
1,015
References
108
Citations by year
2026: 17 · 2025: 62 · 2024: 50 · 2023: 51 · 2022: 67 · 2021: 61 · 2020: 65 · 2019: 84 · 2018: 53 · 2017: 70 · 2016: 62 · 2015: 42 · 2014: 60 · 2013: 63 · 2012: 56
FWCI
25.92
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • HAL (submittedVersion)
Funders
  • National Institute of Mental Health (R01MH054671, MH54671)
  • National Institute of Neurological Disorders and Stroke (R01NS034994, NS034994)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
hippocampal theta rhythm, neural entrainment, phase synchronization, somatosensory cortex, prefrontal cortex, pyramidal neurons, interneurons, hippocampal-neocortical interaction, information transmission
MeSH terms
Animals, Biological Clocks, Evoked Potentials, Hippocampus, Interneurons, Nerve Net, Neural Inhibition, Neural Pathways, Neurons, Theta Rhythm, Pyramidal Cells, Neocortex, Mice, Rats

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