Cited by 707Neural dynamics and brain functionMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Discussion

Robert P. Vertes, Bernát Kocsis·1997·Neuroscience

Abstract

We present a new model for the generation of theta rhythm of the hippocampus. We propose that theta at CA1 involves extracellular current fluxes produced by alternating depolarizing and hyperpolarizing membrane potential fluctuations of large populations of hippocampal pyramidal cells. Pyramidal cells are, in turn, controlled by rhythmically bursting cholinergic and GABAergic cells of the medial septum/vertical limb of the diagonal band. We postulate that septal cholinergic and GABAergic rhythmically bursting cells fire in relative synchrony; their coordinated burst discharge (burst mode) drives the positive-going phase of intracellular theta and associated firing of pyramidal cells; their synchronized pauses (interburst mode) give rise to the negative-going phase of intracellular theta and an inhibition of pyramidal cells. We further demonstrate that the theta rhythm is controlled by a network of cells extending from the brainstem to the septum/hippocampus. During theta, tonically discharging cells of the nucleus reticularis pontis oralis activate neurons of the supramammillary nucleus; the supramammillary nucleus, in turn, converts this steady barrage into a rhythmical pattern of discharge which is relayed to GABAergic/ cholinergic rhythmically bursting cells of the medial septum. The septal rhythmically bursting cells modulate subsets of hippocampal interneurons and principal cells in the generation of the theta rhythm. We review evidence showing that the serotonin-containing neurons of the median raphe nucleus desynchronize the hippocampal electroencephalogram, presumably by disrupting the rhythmical discharge of septal cholinergic and GABAergic neurons. Finally, we summarize recent work indicating that the theta rhythm is critically involved in memory functions of the hippocampus and that its disruption (electroencephalographic desynchronization) may block or temporarily suspend mnemonic processes of the hippocampus.

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Crossref · 10.1016/s0306-4522(97)00239-x

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  • The vHPC theta rhythm is thought to be driven by brainstem nuclei via projections through the medial septum.

    “This rhythm is thought to be driven by brainstem nuclei via projections through the medial septum130”

    From Resolving the neural circuits of anxiety (2015) · cites this paper as [130]

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Authors
Vertes, R. P., & Kocsis, B.
Affiliations
Florida Atlantic University (US)
Venue
Neuroscience
Publisher
Elsevier BV
Published
1997-10
Volume
81
Issue
4
Pages
893-926
ISSN
0306-4522 (ISSN-L)
OpenAlex
W27254585
Cited by
707
References
0
Citations by year
2026: 4 · 2025: 6 · 2024: 6 · 2023: 16 · 2022: 17 · 2021: 23 · 2020: 20 · 2019: 23 · 2018: 19 · 2017: 27 · 2016: 31 · 2015: 32 · 2014: 29 · 2013: 35 · 2012: 27
FWCI
11.79
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ns035883-10)
  • National Institute of Neurological Disorders and Stroke (NS 35883)
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, CA1 pyramidal neurons, medial septum, diagonal band of Brodmann, supramammillary nucleus, serotonin, median raphe nucleus, hippocampal interneurons, memory
MeSH terms
Animals, Brain Stem, Diencephalon, Hippocampus, Humans, Memory, Theta Rhythm

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