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Related Experiment Video

Updated: May 25, 2026

Inter-Brain Synchrony in Open-Ended Collaborative Learning: An fNIRS-Hyperscanning Study
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Inter-Brain Synchrony in Open-Ended Collaborative Learning: An fNIRS-Hyperscanning Study

Published on: July 21, 2021

Increased phase synchronization during continuous face integration measured simultaneously with EEG and fMRI.

Mara Kottlow1, Kay Jann, Thomas Dierks

  • 1Department of Psychiatric Neurophysiology, University Hospital of Psychiatry, University of Bern, Switzerland. kottlow@puk.unibe.ch

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|February 7, 2012
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel method to measure zero-lag phase synchronization in the human brain using EEG/fMRI. Researchers found increased gamma synchronization during face perception, identifying key brain regions involved in visual binding.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Human Brain Imaging

Background:

  • Gamma zero-lag phase synchronization is crucial for visual binding in animal brains.
  • Previous human EEG studies focused on phase locking factor or gamma amplitude, not common-phase signals.
  • A new method is needed to analyze near zero-lag phase synchronization in human subjects.

Purpose of the Study:

  • To introduce and validate a method for identifying human brain networks with near zero-lag phase synchronization.
  • To measure the amount of zero-lag phase synchronization during visual perception tasks.
  • To localize brain regions involved in transient synchronization during face integration.

Main Methods:

  • Presented unpredictable moving face parts (NOFACE) and complete schematic faces (FACE).

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Reliable Acquisition of Electroencephalography Data during Simultaneous Electroencephalography and Functional MRI
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  • Measured zero-lag phase synchronization using global field synchronization (GFS) in specific frequencies.
  • Correlated gamma GFS with simultaneously recorded BOLD (Blood-Oxygen-Level-Dependent) responses.
  • Main Results:

    • Gamma GFS significantly increased during the FACE condition compared to NOFACE.
    • Positive correlations between gamma GFS and BOLD signals were found in the bilateral middle fusiform gyrus and left precuneus.
    • Demonstrated the feasibility of measuring zero-lag phase synchronization between remote human visual system regions using simultaneous EEG/fMRI.

    Conclusions:

    • The identified areas (bilateral middle fusiform gyrus, left precuneus) may form a network for transient synchronization during face integration.
    • This network includes face-specific, binding-specific, and general visual processing regions.
    • Simultaneous EEG/fMRI acquisition enables measurement of zero-lag phase synchronization in the human visual system.