People seek out and pay attention to information and cues that confirm their beliefs. They don’t seek out—in fact, they ignore or even discount—information that doesn’t support what they already believe.

Confirmation bias is responsible for the fact that we tend to look only for information that confirms our existing theories, beliefs, and worldview at the expense of those that conflict with them. We get so attached to these views that even when conflicting evidence is forced upon us, it often only makes us defensive, strengthening our original

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