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EEG Source Reconstruction Reveals Frontal-Parietal Dynamics of Spatial Conflict Processing

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  • Michael X Cohen
  • K Richard Ridderinkhof

Abstract

Cognitive control requires the suppression of distracting information in order to focus on task-relevant information. We applied EEG source reconstruction via time-frequency linear constrained minimum variance beamforming to help elucidate the neural mechanisms involved in spatial conflict processing. Human subjects performed a Simon task, in which conflict was induced by incongruence between spatial location and response hand. We found an early (∼200 ms post-stimulus) conflict modulation in stimulus-contralateral parietal gamma (30–50 Hz), followed by a later alpha-band (8–12 Hz) conflict modulation, suggesting an early detection of spatial conflict and inhibition of spatial location processing. Inter-regional connectivity analyses assessed via cross-frequency coupling of theta (4–8 Hz), alpha, and gamma power revealed conflict-induced shifts in cortical network interactions: Congruent trials (relative to incongruent trials) had stronger coupling between frontal theta and stimulus-contrahemifield parietal alpha/gamma power, whereas incongruent trials had increased theta coupling between medial frontal and lateral frontal regions. These findings shed new light into the large-scale network dynamics of spatial conflict processing, and how those networks are shaped by oscillatory interactions.

Suggested Citation

  • Michael X Cohen & K Richard Ridderinkhof, 2013. "EEG Source Reconstruction Reveals Frontal-Parietal Dynamics of Spatial Conflict Processing," PLOS ONE, Public Library of Science, vol. 8(2), pages 1-14, February.
    • Handle: RePEc:plo:pone00:0057293
    DOI: 10.1371/journal.pone.0057293
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