Rostral anterior cingulate activity generates posterior versus anterior theta activity linked to agentic extraversion.
Recent research using the resting electroencephalogram (EEG) showed that posterior versus anterior theta activity (around 4-8 Hz) is consistently associated with agency, reflecting the dopaminergic core of extraversion (i.e., incentive motivation, positive emotion). Neuroimaging studies using various methodologies and experimental paradigms have converged on the anterior cingulate cortex (ACC) as a neurophysiological correlate of extraversion. The aim of the present study is integrate these lines of research by testing the hypothesis that posterior versus anterior EEG theta is at least partly based on ACC theta activity. Resting EEG data were analyzed in N = 78 healthy, male participants extremely high or low in agentic extraversion (aE). Using the low-resolution electromagnetic tomography algorithm, we localized the sources of aE-dependent intracerebral theta activity within rostral subdivisions of the ACC. The posterior versus anterior index and theta current density within the rostral ACC were significantly correlated (r = -.52), and both displayed high retest stability across 5 hr and were associated with traits from the aE spectrum. These neurophysiological correlates of aE and their possible functional significance are discussed.
Faculty of Psychology, Philipps-Universität Marburg, Gutenbergstr. 18, 35037, Marburg, Germany. chavanon@staff.uni-marburg.de
Mira-Lynn
ML
Chavanon
Jan
J
Wacker
Gerhard
G
Stemmler
D000328:Adult; D001931:Brain Mapping / Q000379:methods*; D005120:Extraversion, Psychological; D005133:Eye Movements / Q000502:physiology; D006179:Gyrus Cinguli / Q000502:physiology*; D006801:Humans; D008297:Male; D013826:Theta Rhythm / Q000502:physiology*
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