Confirmation bias is the tendency to notice, seek out and remember information that fits what we already believe, while quietly discounting whatever contradicts it. It is not a sign of stupidity; it operates in everyone, including experts examining their own field.
How it shows up
The bias works in three stages. We search selectively, typing questions into a search engine that are already loaded towards the answer we expect. We interpret ambiguous evidence as support for our view. And we recall confirming examples more easily than awkward exceptions. Each step feels like ordinary reasoning from the inside.
A classic demonstration
In Peter Wason’s selection experiments in the 1960s, people trying to discover a hidden rule tended to test only cases they expected to confirm it, rather than the cases that could prove it wrong. They sought verification when falsification would have been far more informative. The instinct to look for “yes” rather than “no” is remarkably stubborn.
How to push back
- Ask what would change your mind. If nothing could, you are holding a belief rather than a hypothesis.
- Seek the strongest opposing case. Read the best argument against your position, not the weakest.
- Separate the claim from the claimant. Judge evidence on its merits, not on whether you like its source.
The takeaway
Confirmation bias cannot be switched off, but it can be counteracted by deliberately courting disagreement. The uncomfortable habit of trying to prove yourself wrong is one of the few reliable correctives.
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