Confirmation Bias: How Beliefs Can Filter Evidence
Learn how existing beliefs shape search, attention, and memory—and how opposing evidence, predictions, and clear criteria improve judgment.
Confirmation bias is the tendency to notice, seek, and remember information that supports what we already believe while giving less attention to conflicting evidence. It affects intelligent people because it grows from ordinary limits of attention and motivation.
Search itself can be biased
Asking “Why is this idea correct?” produces different evidence from asking “What would show that it is wrong?” Social groups and recommendation systems can strengthen the effect by repeatedly showing similar views.
A useful defense is to state in advance what evidence would change your mind. Search for the strongest opposing case, separate the quality of a source from whether you like its conclusion, and compare predictions with later results. Complete neutrality is unrealistic, but structured disagreement and transparent criteria make beliefs more responsive to reality. Critical thinking is not doubting everything equally; it is testing claims in ways that could genuinely prove us mistaken.
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Visual logic practice
IQ-style visual reasoning test—not an official IQ test