The pernicious effects of confirmation bias and related models can be explained by cognitive dissonance, the stress felt by holding two contradictory, dissonant, beliefs at once. Scientists have actually linked cognitive dissonance to a physical area in the brain that plays a role in helping you avoid aversive outcomes. Instead of dealing with the underlying cause of this stress—the fact that we might actually be wrong—we take the easy way out and rationalize the conflicting information away. It's a survival instinct!
Chapter:
Being Wrong Less
Section:
Progress, One Funeral At A Time