Confirmation bias — Psychology, 11–13 years
Once we believe something, we tend to notice evidence that supports it and overlook evidence against it. Good thinking includes looking deliberately for information that could prove us wrong.
Looking for agreement
Confirmation bias is the tendency to collect, remember or interpret information in ways that support what we already think. It can happen to anyone, especially when a belief feels connected to pride, fear or belonging. The mind is not simply lying; it is using an efficient but incomplete search.
Why does it happen?
The world offers more information than we can examine, so the brain uses shortcuts to decide what deserves attention. Agreeing evidence feels useful because it protects a working story and saves effort. But a story can become stronger simply because we keep feeding it, not because it is true.
Does a coin have a pattern?
Sam thinks a coin lands heads more often. He records 10 tosses: H, T, H, H, T, T, H, T, T, H, which gives 5 heads and 5 tails. If he remembered only the four heads in a row, his belief would feel confirmed. Recording every result checks the idea instead of selecting convenient evidence.
One example proves it
A common mistake is to treat one vivid example as proof, especially when it matches a suspicion we already have. This is reasonable because memorable events are easy to recall and feel more important than ordinary ones. Ask what evidence would count against the idea, then look for it before deciding.
Checking claims online
Confirmation bias matters when you read a post about food, health, sport or a person you already dislike. A careful reader checks who made the claim, compares independent sources and searches for a serious disagreement. This does not mean treating every opinion as equally strong; it means testing the claim fairly.
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