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Long-range phase synchronization of high-frequency oscillations in human cortex.

G Arnulfo1,2, S H Wang3,4,5, V Myrov3,5

  • 1Neuroscience Center, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland. gabriele.arnulfo@dibris.unige.it.

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|October 24, 2020
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Summary

High-frequency oscillations (HFOs) synchronize across distant brain regions, challenging previous assumptions. This widespread HFO synchronization reveals novel insights into neuronal communication and brain network dynamics.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Neuronal oscillations below 100 Hz synchronize across brain areas, regulating circuit communication.
  • Faster oscillations (>100 Hz) were traditionally viewed as local phenomena, lacking large-scale synchronization.

Purpose of the Study:

  • To investigate whether high-frequency oscillations (HFOs) synchronize between widely distributed brain regions.
  • To characterize the properties and functional significance of HFO synchronization.

Main Methods:

  • Analysis of human intracerebral recordings.
  • Examination of HFO synchronization patterns, frequency peaks, connectivity, and laminar profiles.
  • Investigation of HFO synchronization during a response-inhibition task.

Main Results:

  • Demonstrated synchronization of 100-400 Hz HFOs across distributed brain regions.
  • Identified stable community structuring within HFO synchronization patterns.
  • Observed a laminar profile for HFO synchronization distinct from lower frequencies.
  • Showed transient enhancement and suppression of HFO synchronization in specific frequency bands during task performance.

Conclusions:

  • HFO synchronization represents a significant form of neuronal spike-timing relationships.
  • HFO synchronization serves as a mesoscopic indicator of neuronal communication.
  • Challenges the notion that fast neuronal activities are exclusively local phenomena.