EEG source reconstruction reveals frontal-parietal dynamics of spatial conflict processing
- Publisher: Public Library of Science (PLoS)
(issn: 1932-6203, eissn: 1932-6203)
Electroencephalography | Social and Behavioral Sciences | Research Article | Biology | Diagnostic Medicine | Cognitive Psychology | Cognition | Clinical Neurophysiology | Neuroscience | Psychometrics | Medicine | Learning | Neuroimaging | Q | R | Psychology | Science | Adjustment (Psychology) | Cognitive Neuroscience | Behavior | Neurology
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.