Default network deactivations are correlated with psychopathic personality traits

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Social Neuroscience

Background:

• The posteromedial cortex (PMC) and medial prefrontal cortex (mPFC) are key components of the brain's default network.
• This network shows reduced activity during goal-directed tasks and is implicated in self-referential, social, and affective processes.
• The connection between these default network regions and personality traits, particularly in social contexts, remains unclear.

Purpose of the Study:

• To investigate the relationship between deactivations in the PMC and mPFC and psychopathic personality traits.
• To explore how specific brain activity patterns in default network regions relate to individual differences in personality.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
• Participants completed a self-report measure to assess psychopathic personality traits.
• Statistical analyses were conducted to correlate brain activity patterns with personality measures.

Main Results:

• Deactivations in the PMC were found to predict traits associated with egocentricity.
• Deactivations in the mPFC were found to predict traits related to decision-making.
• These findings highlight distinct roles for PMC and mPFC in personality.

Conclusions:

• The PMC and mPFC are associated with self-relevancy and affective decision-making.
• Default network activity is demonstrably linked to specific personality traits.
• This research provides novel insights into the neural underpinnings of personality.