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Updated: Sep 13, 2025

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Time-resolved large-scale neural coactivations in macaque monkey.

Valarie Ivey1, Han Yuan2, Lei Ding2

  • 1Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, USA.

Neuroimage
|August 2, 2025
PubMed
Summary
This summary is machine-generated.

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Large-scale brain coactivation patterns (CAPs) observed in monkeys using electrocorticography (ECoG) closely resemble those found in humans via electroencephalography (EEG). These fast, frequency-specific brain dynamics are evolutionarily preserved and functionally important across species.

Area of Science:

  • Neuroscience
  • Comparative Neurophysiology
  • Systems Neuroscience

Background:

  • Large-scale distributed brain activations are crucial for information processing and integration.
  • These patterns are observed in human hemodynamic and electrical/magnetic signals, and in animal brains, suggesting evolutionary preservation.
  • Human electroencephalography (EEG) and magnetoencephalography (MEG) studies reveal frequency-specific, fast dynamics (tens of milliseconds) in these activations, but this remains uninvestigated in animals.

Purpose of the Study:

  • To investigate time-resolved large-scale coactivation patterns (CAPs) in monkey brains using electrocorticography (ECoG).
  • To compare monkey ECoG CAPs with whole-head human EEG CAPs during resting states.
  • To determine if fast, large-scale brain dynamics are conserved across species.
Keywords:
Co-activation patternsElectrocorticographyElectroencephalographyFast dynamicsMonkeyTime-resolved

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Main Methods:

  • Utilized electrocorticography (ECoG) data from nearly entire hemisphere(s) in monkeys.
  • Analyzed resting-state ECoG data to identify time-resolved large-scale coactivation patterns (CAPs).
  • Compared monkey CAPs with previously reported human EEG CAPs, focusing on spatial, temporal, and band-specific (alpha band) similarities.

Main Results:

  • Identified brain-wide CAPs in monkey ECoG data that show significant similarities to human EEG CAPs.
  • Similarities were observed in spatial and temporal patterns of individual CAPs and their relative differences, particularly in the alpha band.
  • Transition patterns among monkey CAPs revealed a superstructure similar to humans, governing resting-state brain dynamics and spatial expression.

Conclusions:

  • Fast, large-scale brain events (CAPs) exist in non-human primates, mirroring human brain activity.
  • These dynamics are evolutionarily conserved and likely of functional importance across species.
  • The findings support the cross-species relevance of studying dynamic, large-scale brain organizations.