Cited by 189Neural dynamics and brain functionFunctional Brain Connectivity StudiesComplex Systems and Time Series Analysis

Bistability and Non-Gaussian Fluctuations in Spontaneous Cortical Activity

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Freyer, F., Aquino, K., Robinson, P. A., Ritter, P., Breakspear, M.·2009·Journal of Neuroscience

Abstract

The brain is widely assumed to be a paradigmatic example of a complex, self-organizing system. As such, it should exhibit the classic hallmarks of nonlinearity, multistability, and "nondiffusivity" (large coherent fluctuations). Surprisingly, at least at the very large scale of neocortical dynamics, there is little empirical evidence to support this, and hence most computational and methodological frameworks for healthy brain activity have proceeded very reasonably from a purely linear and diffusive perspective. By studying the temporal fluctuations of power in human resting-state electroencephalograms, we show that, although these simple properties may hold true at some temporal scales, there is strong evidence for bistability and nondiffusivity in key brain rhythms. Bistability is manifest as nonclassic bursting between high- and low-amplitude modes in the alpha rhythm. Nondiffusivity is expressed through the irregular appearance of high amplitude "extremal" events in beta rhythm power fluctuations. The statistical robustness of these observations was confirmed through comparison with Gaussian-rendered phase-randomized surrogate data. Although there is a good conceptual framework for understanding bistability in cortical dynamics, the implications of the extremal events challenge existing frameworks for understanding large-scale brain systems.

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Crossref · 10.1523/jneurosci.0754-09.2009

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  • Neural activity often exhibits multimodal distributions, reflecting transitions between distinct dynamical states rather than continuous fluctuations around a single equilibrium.

    “Neural activity often exhibits multimodal distributions, reflecting transitions between distinct dynamical states rather than continuous fluctuations around a single equilibrium (Deco et al. 2011; Freyer et al. 2009; Kinouchi and Copelli 2006).”

    From The myth of the Bayesian brain (2025) · cites this paper as Freyer et al. 2009

    The Examples of bimodal exponential distributions section reports bimodal alpha activity in 13 of 16 subjects, and the Discussion describes switching between two distinct modes rather than continuous, unimodal mixing. This supports the proposed interpretation for resting-state human EEG alpha activity, but not the broader assertion that neural activity generally often has multimodal distributions. (LLM, conf=0.84)

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  • Neural fluctuations frequently follow heavy-tailed distributions, including power-law, log-normal, and Lévy-stable distributions rather than Gaussian profiles.

    “Neural fluctuations frequently follow heavy-tailed distributions, including power-law, log-normal, and Lévy-stable distributions rather than Gaussian profiles (Beggs and Plenz 2003; Chialvo 2010; Freyer et al. 2009; Metzler and Klafter 2000; Touboul and Destexhe 2010).”

    From The myth of the Bayesian brain (2025) · cites this paper as Freyer et al. 2009

    In “Examples of unimodal non-Gaussian distributions” (page unavailable), the paper reports frequent heavy right-hand tails in resting-state EEG power fluctuations, with a bias toward power-law scaling and a better fit from a Fisher–Tippett distribution. It does not report log-normal or Lévy-stable distributions, and its finding concerns particular frequencies rather than neural fluctuations generally. (LLM, conf=0.88)

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Research works printed but not linked: 1

  1. [45]45. Ritter P, Becker R, Freyer F, Villringer A (2009b) EEG quality: the image acquisition artifact. In: EEG-fMRI: physiological basis, technique, and applications (Mulert C, Lemieux L, eds). Heidelberg: Springer, in press.

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Authors
Freyer, F., Aquino, K., Robinson, P. A., Ritter, P., & Breakspear, M.
Affiliations
  • Charité – Universitätsmedizin Berlin (DE)
  • The University of Sydney (AU)
Venue
Journal of Neuroscience
Published
2009-07-01
Volume
29
Issue
26
Pages
8512-8524
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2060524608
Cited by
189
References
65
Citations by year
2026: 10 · 2025: 18 · 2024: 10 · 2023: 9 · 2022: 5 · 2021: 8 · 2020: 9 · 2019: 6 · 2018: 11 · 2017: 13 · 2016: 15 · 2015: 12 · 2014: 14 · 2013: 16 · 2012: 16
FWCI
5.32
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Digital Library (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • James S. McDonnell Foundation (JSMF22002082)
  • Robert Bosch Stiftung
  • Bundesministerium für Bildung und Forschung
  • Australian Research Council (DP0667065, TS0669860)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Complex Systems and Time Series Analysis
Keywords
bistability, non-Gaussian fluctuations, spontaneous cortical activity, resting-state EEG, alpha rhythm, beta oscillations, neural oscillations, burst firing, nonlinear brain dynamics, self-organization
MeSH terms
Adult, Bayes Theorem, Brain Mapping, Cerebral Cortex, Electroencephalography, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Models, Neurological, Oxygen, Rest, Spectrum Analysis, Stochastic Processes, Time Factors, Models, Statistical, Normal Distribution, Nonlinear Dynamics, Principal Component Analysis, Young Adult

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