Warmth is more influential than competence: an fMRI repetition suppression study

Area of Science:

• Cognitive Neuroscience
• Social Psychology
• Neuroimaging

Background:

• Previous studies identified neural representations of social traits in the medial prefrontal cortex (mPFC).
• Research has primarily examined warmth and competence traits separately, not their differential neural coding.
• The 'Big Two' theory posits warmth and competence as fundamental dimensions of social impression formation.

Purpose of the Study:

• To investigate potential differences in the neural representation of warmth versus competence traits in the mPFC.
• To explore how the brain processes and distinguishes between these two fundamental social dimensions.
• To examine the influence of trait valence and repetition on neural activity within the mPFC.

Main Methods:

• Functional magnetic resonance imaging (fMRI) with repetition suppression technique was employed.
• Participants viewed behavioral descriptions implying warmth or competence traits.
• Repetition suppression was measured by reduced neural response to repeated trait presentations.

Main Results:

• Robust repetition suppression was observed in the mPFC specifically for warmth-related traits, irrespective of valence.
• This suppression effect was significantly stronger when primed with similar or opposite warmth traits compared to trait-irrelevant primes.
• No similar suppression pattern was detected in other brain regions.

Conclusions:

• Neural representations of warmth and competence traits in the mPFC are not entirely independent.
• The warmth dimension appears to exert a stronger influence on neural processing during impression formation than competence.
• Findings extend the 'Big Two' theory by providing insights into the neural underpinnings of social cognition.