Cited by 710Neural dynamics and brain functionSleep and Wakefulness ResearchNeuroscience and Neuropharmacology Research

Origin of Slow Cortical Oscillations in Deafferented Cortical Slabs

Timofeev, I.·2000·Cerebral Cortex

Abstract

An in vivo preparation has been developed to study the mechanisms underlying spontaneous sleep oscillations. Dual and triple simultaneous intracellular recordings were made from neurons in small isolated cortical slabs (10 mm x 6 mm) in anesthetized cats. Spontaneously occurring slow sleep oscillations, present in the adjacent intact cortex, were absent in small slabs. However, the isolated slabs displayed brief active periods separated by long periods of silence, up to 60 s in duration. During these silent periods, 60% of neurons showed non-linear amplification of low-amplitude depolarizing activity. Nearly 40% of the cells, twice as many as in intact cortex, were classified as intrinsically bursting. In cortical network models based on Hodgkin-Huxley-like neurons, the summation of simulated spontaneous miniature excitatory postsynaptic potentials was sufficient to activate a persistent sodium current, initiating action potentials in single neurons that then spread through the network. Consistent with this model, enlarging the isolated cortical territory to an isolated gyrus (30 mm x 20 mm) increased the probability of initiating large-scale activity. In these larger territories, both the frequency and regularity of the slow oscillation approached that generated in intact cortex. The frequency of active periods in an analytical model of the cortical network accurately predicted the scaling observed in simulations and from recordings in cortical slabs of increasing size.

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Crossref · 10.1093/cercor/10.12.1185

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Authors
Timofeev, I.
Affiliations
Université Laval (CA)
Corresponding author
Timofeev, I.
Venue
Cerebral Cortex
Published
2000-12-01
Volume
10
Issue
12
Pages
1185-1199
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2152587029
Cited by
710
References
66
Citations by year
2026: 17 · 2025: 33 · 2024: 26 · 2023: 43 · 2022: 32 · 2021: 24 · 2020: 28 · 2019: 30 · 2018: 25 · 2017: 37 · 2016: 31 · 2015: 34 · 2014: 35 · 2013: 32 · 2012: 31
FWCI
9.78
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
sleep oscillations, deafferentation, spontaneous neuronal activity, silent period, miniature excitatory postsynaptic potentials, persistent sodium current, bursting neurons, cortical network model, Hodgkin-Huxley neurons, network size scaling, cats
MeSH terms
Animals, Cats, Cerebral Cortex, Denervation, Electrophysiology, Models, Neurological, Nerve Net, Neurons, Oscillometry, Thalamus, Excitatory Postsynaptic Potentials, In Vitro Techniques

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