This mental mechanism developed during evolution as a way to conserve energy. Our brains are reluctant to expend resources revising our basic worldview, as admitting we’re wrong causes severe cognitive dissonance and emotional discomfort. When a person encounters news that confirms their views, the brain releases dopamine, the pleasure hormone. If information contradicts their beliefs, it is automatically perceived as hostile, unreliable, or paid for by opponents, and the brain activates psychological defense mechanisms.