Confirmation Bias
The cognitive tendency to seek out information that supports one's existing beliefs or hypotheses while ignoring or undervaluing contradictory evidence. It is among the longest-studied cognitive biases and shapes everyday judgment across a wide range of situations.
What Is Confirmation Bias
Confirmation bias is the cognitive tendency to preferentially seek, remember, and interpret information that supports what one already believes, while ignoring or dismissing information that contradicts those beliefs. If you think "that person can't be trusted," their honest actions go unnoticed, but the slightest suspicious behavior reinforces your conviction with a "knew it." This is the classic operation of confirmation bias. The name comes from the British psychologist Peter Wason, who coined it in the course of a series of reasoning experiments in the 1960s: people reach for evidence that their hypothesis holds rather than for evidence that would break it.
The Three Stages of Confirmation Bias
Confirmation bias operates at all three stages of information processing. First, the "information gathering" stage. You choose news sources that support your views and avoid media with opposing perspectives. Second, the "information interpretation" stage. You interpret ambiguous information in a way that favors your position. This is why both proponents and opponents can cite the same statistical data as evidence for their respective arguments. Third, the "information recall" stage. Information consistent with your beliefs is remembered vividly, while contradictory information is easily forgotten. Through this triple filter, people unconsciously construct an information environment that continuously reinforces their beliefs. As Raymond Nickerson's 1998 review of the literature makes clear, the pattern is not confined to particular personalities or professions; it has turned up again and again across different populations and settings.
Why Confirmation Bias Is So Powerful
What makes confirmation bias so insidious is that it is not the kind of flaw that fades as intelligence or education rises. If anything, someone skilled at building a case for what they already believe may express the bias in more refined forms. The first step in coping is to accept as a given that you are under the influence of confirmation bias. The self-perception that "I am objective" is what keeps the bias most firmly in place. Deliberately seeking opposing viewpoints and striving to understand the strongest counterarguments to your own beliefs is a practical way to loosen its grip. The dividing line is whether you can treat a dissenting view as material that shows you what you missed rather than as an opponent to be defeated.
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