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Related Concept Videos

Brain Imaging01:14

Brain Imaging

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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...
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Related Experiment Video

Updated: Jun 16, 2025

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Quantifying task-locked information transmission between cortical areas with TMS-EEG.

Zhaohuan Ding1, Wenbo Ma2, Leixiao Feng3

  • 1Shien-Ming Wu School of Intelligent Engineering, South China University of Technology, Guangzhou 510640, China.

Neuroimage
|June 13, 2025
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Summary

This study introduces Transcranial Magnetic Stimulation combined with Electroencephalography (TMS-EEG) to map neural network activity and information flow during a visually guided saccade task. The findings quantify dynamic connectivity between cortical areas, advancing our understanding of brain function.

Keywords:
Directed transfer function (DTF)Information transmission connectomeSaccade taskTMS-EEG

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biomedical Engineering

Background:

  • Understanding task-locked neural network activation and information transmission is crucial for deciphering brain function.
  • Existing methods may not fully capture the dynamic nature of neural communication between cortical areas.

Purpose of the Study:

  • To develop and validate Transcranial Magnetic Stimulation combined with Electroencephalography (TMS-EEG) technology.
  • To dynamically quantify information transmission and neural network activation during a visually guided saccade task.
  • To investigate directed information flow between the prefrontal cortex (PFC) and posterior parietal cortex (PPC).

Main Methods:

  • 30 participants performed a visually guided gap saccade task.
  • TMS-EEG data were recorded with TMS pulses applied to PFC and PPC at different task stages.
  • The Directed Transfer Function (DTF) method was used to analyze information flow in alpha, beta, and gamma frequency bands.

Main Results:

  • Successful task performance with >90% accuracy and mean saccade latency of 132.25 ±22.59 ms.
  • Significant differences in information flow within gamma bands between PFC and PPC were observed at different time points.
  • Specific electrode activity (C3, P3) identified as hubs for information transfer during task processing.

Conclusions:

  • DTF values derived from TMS-EEG effectively characterize information flow between cortical areas during a saccade task.
  • This approach offers a novel method for quantifying dynamic changes in connectivity and causality.
  • The study demonstrates TMS-EEG's potential for mapping functional brain networks.