MENTAL MODEL · M4022

Confirmation Bias

Learn & MetacognitionHigh supportCognitive Psychology

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

People tend to seek, interpret, and remember information that supports their existing beliefs, while ignoring or undervaluing contrary evidence. It is one of the most common and persistent cognitive biases, affecting everything from daily judgments to scientific research.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Seeking opposing viewpoints. In decision-making, hypothesis testing, and critical thinking, actively look for evidence that could falsify one's own viewpoint. This helps us avoid falling into the "echo chamber effect" and maintain open-mindedness and objectivity.

anchor

Anchor fast decisions

The human brain uses existing beliefs as a filter: selectively attending to supportive information, interpreting ambiguous evidence in a confirmatory way, and memory bias favoring confirmatory information. This is driven by both motivational factors (maintaining self and positions) and cognitive factors (saving cognitive effort), leading to self-reinforcement of beliefs.

MINIMUM ACTION

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Practice this model in one real situation:

Before making decisions, actively search for disconfirming evidence (seek opposing viewpoints)
list "evidence that could falsify my view"
use red teaming and premortem
find dissenters to challenge
distinguish the weight of "support" vs. "falsification".

Check to track your progress (stored locally)

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Confirmation_biasZH · Explicit
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