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The phenomenon where members of a group actively reinforce each other's biased information processing through social feedback. An individual tentatively expresses a preference; others nod, agree, or amplify. This social confirmation strengthens the individual's conviction and signals to the group that this position is acceptable. The process iterates, rapidly producing a consensus that is more extreme and more confident than any member's initial inclination. Shared confirmation bias is the engine of groupthink, polarization, and ideological lock-in.
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