Extraversion and fronto-posterior EEG spectral power gradient: an independent component analysis

Area of Science:

• Neuroscience
• Cognitive Psychology
• Personality Psychology

Background:

• The fronto-posterior electroencephalography (EEG) spectral power gradient is a recognized individual trait linked to personality.
• Debate exists regarding its specific association with agentic extraversion and theta frequencies versus broader traits and bands.
• The precise cortical regions involved in this EEG gradient remain under investigation.

Purpose of the Study:

• To investigate the relationship between the fronto-posterior EEG spectral power gradient and agentic extraversion.
• To determine if this gradient is specific to theta frequencies or extends to other frequency bands.
• To identify the specific cortical regions contributing to the observed EEG-personality associations.

Main Methods:

• Group independent component analysis (ICA) was employed to analyze EEG data.
• Source localization techniques were utilized to pinpoint the origin of brain activity.
• Regression analyses were performed to assess predictive relationships between EEG activity and personality traits.

Main Results:

• Agentic extraversion correlated with increased theta activity in the default mode network's (DMN) posterior hub.
• Agentic extraversion was associated with decreased theta activity in the orbitofrontal cortex (OFC).
• Theta band activity was a stronger predictor of agentic extraversion than other frequency bands.

Conclusions:

• Extraverts demonstrate higher tonic activity in the OFC and lower tonic activity in the DMN compared to introverts.
• The fronto-posterior EEG spectral power gradient, particularly in the theta band, is specifically related to agentic extraversion.
• Findings elucidate the neural underpinnings of personality differences in brain activity.