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Related Experiment Video

Updated: Sep 13, 2025

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From Gamma Coherence to Theta-Phase Synchronization: Task-Dependent Interhemispheric Integration in Boundary-Free

Yunfang Xu1, Xiaoxiao Yang1, Zhengye Si1

  • 1School of Artificial Intelligence, Beijing Normal University, Beijing 100875, China.

Brain Sciences
|July 29, 2025
PubMed
Summary

Theta-band synchronization is key for brain coordination during boundary-free multiple-object tracking (MOT). This study reveals theta-band phase synchronization enhances interhemispheric integration for better task performance.

Keywords:
EEGfunctional connectivitymultiple object tracking (MOT)phase locking value (PLV)synchronization

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Human Brain Mapping

Background:

  • Multiple-object tracking (MOT) demands sustained attention and interhemispheric integration.
  • Previous research linked gamma-band coherence to integration in tasks with visible boundaries.
  • Neural mechanisms for boundary-free MOT integration were previously unclear.

Purpose of the Study:

  • Investigate brain functional connectivity during boundary-free MOT.
  • Examine neural mechanisms of interhemispheric coordination in complex visual tasks.
  • Determine the role of theta-band synchronization in boundary-free MOT.

Main Methods:

  • Electroencephalography (EEG) recorded from 38 healthy participants during MOT tasks.
  • Experimental conditions varied target load (2 vs. 4) and movement (within vs. between hemifield).
  • Analyzed phase locking value (PLV) and network properties in theta-band oscillations.

Main Results:

  • Performance decreased with higher target load and between-hemifield movements.
  • Increased theta-band PLV observed in the four-target between-hemifield condition, indicating enhanced interhemispheric synchronization.
  • Higher theta-band synchronization correlated positively with task accuracy; males outperformed females.

Conclusions:

  • Theta-band phase synchronization is crucial for interhemispheric integration in boundary-free MOT.
  • Findings extend prior work on gamma-band coherence in visible-boundary tasks.
  • Provides novel insights into neural mechanisms of interhemispheric coordination during demanding cognitive tasks.