EEG source reconstruction reveals frontal-parietal dynamics of spatial conflict processing

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Computational Neuroscience

Background:

• Cognitive control is essential for focusing on relevant information and suppressing distractions.
• Understanding the neural basis of spatial conflict processing is crucial for cognitive neuroscience.

Purpose of the Study:

• To investigate the neural mechanisms underlying spatial conflict processing using electroencephalography (EEG).
• To elucidate the role of oscillatory brain activity and network interactions in resolving spatial conflict.

Main Methods:

• Applied EEG source reconstruction using time-frequency linear constrained minimum variance beamforming.
• Utilized the Simon task to induce spatial conflict via incongruent spatial location and response hand.
• Performed inter-regional connectivity analyses using cross-frequency coupling.

Main Results:

• Observed early conflict modulation in parietal gamma-band activity (∼200 ms post-stimulus).
• Detected later conflict modulation in the alpha-band, suggesting spatial inhibition.
• Found conflict-induced shifts in cortical network interactions, including altered theta-alpha/gamma coupling.

Conclusions:

• Spatial conflict processing involves early detection via gamma oscillations and subsequent inhibition via alpha oscillations.
• Cortical network dynamics, particularly theta-gamma and theta-alpha coupling, are modulated by spatial conflict.
• These findings enhance our understanding of large-scale brain network interactions in cognitive control.