Does a change of mind stem from genuine conviction or external influence? Cutting-edge research reveals that these two forms of social influence engage distinct brain pathways.
When we act against our beliefs, we often adjust them to ease cognitive dissonance. Yet, new evidence suggests we're more swayed by the person delivering information than the data itself. A landmark study published in PLOS Biology on March 2, 2020, by neurologists from the University of Oxford (UK) and the University of Freiburg (Germany), demonstrates how these influences differ neurologically.
Participants attempted to recall a point's location on a screen, rating their confidence before reviewing feedback attributed to a computer or a fellow human (actually all computer-generated). Researchers used functional magnetic resonance imaging (fMRI) to track brain activity throughout.
Findings were striking: volunteers deferred more to 'human' opinions during low-confidence moments, linked to heightened activity in the dorsal anterior cingulate cortex (Brodmann's area 32)—a region key for error detection and reasoning.
Reciprocity amplified this effect, but only when participants believed feedback came from a human. This normative influence correlated with stronger functional connections to Brodmann's area 32 and social processing regions.
Ultimately, the dorsal anterior cingulate cortex weighs social opinions, treating human and machine info equally on informational merit. However, social norms like reciprocity render machine input negligible.
