Cited by 2,725Neural dynamics and brain functionNeuroscience and Neuropharmacology ResearchNeuroscience and Music Perception

Rhythms for cognition: communication through coherence

Open access
Fries, Pascal·2015·Neuron

Abstract

I propose that synchronization affects communication between neuronal groups. Gamma-band (30-90 Hz) synchronization modulates excitation rapidly enough so it escapes the following inhibition and activates postsynaptic neurons effectively. Synchronization also ensures that a presynaptic activation pattern arrives at postsynaptic neurons in a temporally coordinated manner. At a postsynaptic neuron, multiple presynaptic groups converge, e.g. representing different stimuli. If a stimulus is selected by attention, its neuronal representation shows stronger and higher-frequency gamma-band synchronization. Thereby, the attended stimulus representation selectively entrains postsynaptic neurons. The entrainment creates sequences of short excitation and longer inhibition that are coordinated between pre- and postsynaptic groups to transmit the attended representation and shut out competing inputs. The predominantly bottom-up directed gamma-band influences are controlled by predominantly top-down directed alpha-beta band (8-20 Hz) influences. Attention itself samples stimuli at a 7-8 Hz theta rhythm. Thus, several rhythms and their interplay render neuronal communication effective, precise and selective.

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Crossref · 10.1016/j.neuron.2015.09.034

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  • Mammalian consciousness is generally correlated with a combination of lower harmonic frequencies as well as gamma.

    “but mammalian consciousness is generally correlated with a combination of lower harmonic frequencies as well as gamma (Fries, 2015).”

    From The Easy Part of the Hard Problem: A Resonance Theory of Consciousness (2019) · cites this paper as Fries, 2015

    The section “Theta-rhythmic gamma-band synchronization implements attentional sampling” (page unavailable) describes theta-rhythmic resetting of gamma synchronization, so the paper does discuss a lower-frequency rhythm interacting with gamma. It relates that interaction to attention, however, not to a general correlation with mammalian consciousness; the claimed consciousness link is unsupported. (LLM, conf=0.79)

    Experimental — accuracy not yet measured
  • Many brain regions exhibit population activity where only a fraction of neurons are active simultaneously, with spike timing locked to ongoing oscillatory rhythms.

    “Many brain regions exhibit population activity where only of neurons are active simultaneously, with spike timing locked to ongoing oscillatory rhythms (Fries 2015; Olshausen and Field 2004).”

    From The myth of the Bayesian brain (2025) · cites this paper as Fries 2015

    The section “Gamma-band coherence renders communication precise” (page unavailable) describes spikes synchronized to a phase of the gamma cycle, supporting the rhythm-locked spike-timing part of the claim. It says communication occurs during a small fraction of the *cycle*, not that only a fraction of *neurons* are active simultaneously across many brain regions. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Actual neural activity is highly sparse and temporally structured.

    “In contrast, empirical evidence suggests that actual neural activity is highly sparse and temporally structured.”

    From The myth of the Bayesian brain (2025) · cites this paper as Fries 2015

    The sections on gamma-band coherence describe temporally focused excitation and inhibition, with spikes occurring at particular phases of the gamma cycle. That supports the temporal-structure part of the claim, but the passages do not establish that neural activity is highly sparse. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • In mammalian brains, a specific combination of gamma, beta and theta electrical synchrony is one possible neural correlate of consciousness.

    “One of the possible “neural correlates of consciousness” in mammalian brains is a specific combination of gamma, beta and theta electrical synchrony.”

    From The Easy Part of the Hard Problem: A Resonance Theory of Consciousness (2019) · cites this paper as Fries, 2015

    The section “Theta-rhythmic gamma-band synchronization implements attentional sampling” (page unavailable) links beta, gamma, and theta rhythms to attentional influences, selective communication, and attentional sampling. It does not identify their combination as a neural correlate of consciousness in mammalian brains; that is the unsupported part of the claim. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Shared resonance leads to increased and faster energy and information flows in any set of oscillating structures, such as neurons.

    “In any set of oscillating structures, such as neurons, shared resonance (sync) leads to increased and faster energy/information flows (the blue arrows) because energy/information flows work together, in “sync,” and are thus amplified (coherent) rather than being “out of sync” (incoherent).”

    From The Easy Part of the Hard Problem: A Resonance Theory of Consciousness (2019) · cites this paper as Fries, 2015

    In “The essence of CTC” (page not provided), the paper says coherence between neuronal groups enhances effective connectivity and makes communication selective. It does not extend this principle to any set of oscillating structures or claim that synchronization increases energy flow or makes information flow faster. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

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Authors
Fries, P.
Affiliations
Radboud University Nijmegen (NL)
Corresponding author
Fries, Pascal
Venue
Neuron
Publisher
Elsevier BV
Published
2015-10
Volume
88
Issue
1
Pages
220-235
ISSN
0896-6273 (ISSN-L)
OpenAlex
W1902335101
Cited by
2,725
References
105
Citations by year
2026: 334 · 2025: 297 · 2024: 286 · 2023: 271 · 2022: 279 · 2021: 295 · 2020: 268 · 2019: 250 · 2018: 198 · 2017: 148 · 2016: 93 · 2015: 1 · 2014: 1
FWCI
14.42
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion, cc-by)
  • Radboud Repository (Radboud University) (submittedVersion)
Funders
  • Agence Nationale de la Recherche (ANR-15-CE32-0016)
  • National Institutes of Health (5u54mh091657-05)
  • National Institute of Mental Health (1U54 MH091657, U54-MH091657)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neuroscience and Music Perception
Keywords
neuronal synchronization, gamma oscillations, alpha and beta oscillations, theta oscillations, attention, neural communication, postsynaptic excitation, inhibition, entrainment, top-down control, bottom-up processing, cognitive rhythms
MeSH terms
Brain, Cognition, Cortical Synchronization, Electroencephalography, Humans, Synaptic Transmission, Neurons, Theta Rhythm

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