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Lateralization difference in functional activity during Stroop tasks: a functional near-infrared spectroscopy and EEG

Zemeng Chen1, Xiang Ji1, Ting Li1

  • 1Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China.

Frontiers in Psychiatry
|September 8, 2023
PubMed
Summary

The human brain shows leftward lateralization in frontal lobes during cognitive conflict tasks, particularly with incongruent stimuli. Combining Electroencephalogram (EEG) and functional Near-infrared Spectroscopy (fNIRS) enhances understanding of brain connectivity.

Keywords:
Stroop taskbrain connectivity analysiselectroencephalogramevent-related potentialfunctional near-infrared spectroscopylateralization difference

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Brain Connectivity

Background:

  • Conflict monitoring is crucial for cognitive function and understanding cognitive disorders.
  • Neuroimaging techniques are vital for studying brain activity during cognitive tasks.

Purpose of the Study:

  • To investigate brain activity and connectivity during cognitive conflict processing using a dual-modality approach.
  • To determine the role of frontal lobes in conflict monitoring and identify potential lateralization patterns.

Main Methods:

  • Simultaneous recording of Electroencephalogram (EEG) and functional Near-infrared Spectroscopy (fNIRS) during a Chinese word-color Stroop task.
  • Analysis of brain connectivity using Pearson correlation, Granger Causality (GC), and Wavelet Transform Coherence (WTC).

Main Results:

  • Electroencephalogram (EEG) analysis revealed no significant lateralization in brain connectivity.
  • Functional Near-infrared Spectroscopy (fNIRS) indicated significant leftward lateralization in the frontal lobes during conflict processing, especially with incongruent stimuli.
  • Evidence of increased functional connectivity and information flow from the left to the right frontal lobe during complex conflict tasks.

Conclusions:

  • The combination of EEG and fNIRS provides a powerful dual-modality tool for cognitive and physiological research.
  • The left frontal lobe plays a leading role in processing cognitive conflict, demonstrating leftward lateralization.