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Confirmation Bias

Also Known As: Myside Bias Confirmatory Bias
Cognitive Bias ID: confirmation_bias

Definition

Confirmation bias is the tendency to search for, interpret, favor, and recall information in a way that confirms one's pre-existing beliefs or hypotheses. It affects every stage of information processing, from what questions we ask to how we remember outcomes. This bias is particularly insidious because it operates largely unconsciously.

Examples

A manager who believes a particular employee is underperforming notices every mistake the employee makes while overlooking their successes, building a case that confirms the initial negative impression.

An investor who strongly believes a particular stock will rise skims past every analyst report predicting a decline, while carefully reading and sharing every bullish forecast — becoming more and more convinced the stock is a guaranteed winner.

A person who believes a new coworker is arrogant interprets their confident presentation style as showing off, their silence in meetings as dismissiveness, and their direct emails as rudeness — while a colleague with a neutral first impression sees the same behaviors as professionalism.

Verification Steps
Verification Steps
Binary yes/no questions that an AI must answer to detect a reasoning pattern in a text.
Each of the 452 aspects has verification steps — simple yes/no questions designed to systematically detect whether a pattern appears in a text. For ad hominem: "Does the argument attack a person rather than their claim?" For false dichotomy: "Are only two options presented when more exist?" This ensures consistent, reproducible analysis.

Binary (yes/no) questions an LLM must answer to identify this aspect:

  1. 1

    Does the text primarily present evidence supporting a pre-existing belief?

    Type: binary
  2. 2

    Is contradictory or disconfirming evidence ignored, dismissed, or not mentioned?

    Type: binary
  3. 3

    Does the author show awareness of evidence that could challenge their position?

    Type: binary
Deep Dive
The expandable detail section on each aspect page with examples, psychology, and counter-strategies.
The Deep Dive section provides in-depth information about each aspect: a real-world example showing the pattern in action, an explanation of why it works psychologically, practical advice on how to counter it, alternative names, and links to related aspects.

Related Aspects

→ triggers
Hasty Generalization

Drawing broad conclusions from limited, unrepresentative, or anecdotal evidence.

→ triggers
P-Hacking (Data Dredging)

Running multiple analyses until p<0.05 and only reporting significant results.

→ triggers
Ghost Variables

Gathering data on multiple variables but omitting non-significant ones from report.

→ correlates with
Semmelweis Reflex

Reflex-like rejection of new evidence contradicting established norms.

← correlates with
P-Hacking (Data Dredging)

Running multiple analyses until p<0.05 and only reporting significant results.

← correlates with
Ghost Variables

Gathering data on multiple variables but omitting non-significant ones from report.

← correlates with
Show the Other Side Deficit

Stating a controversial claim as absolute fact without acknowledging opposing views.

← correlates with
Straw Man

Distorting or caricaturing an opponent's argument to attack it more easily.

← correlates with
Bayesian Reasoning

Probability-based belief revision using Bayes' theorem.

← related to
Wishful Thinking

Wishful thinking is a cognitive bias in which the desirability of a belief influences the assessment of its truth. People believe things because they want them to be true, not because evidence supports them. This bias operates at the interface of emotion and cognition: desires distort probability assessment, evidence evaluation, and information seeking. It is related to but distinct from optimism bias — wishful thinking specifically involves the causal influence of desire on belief formation, not merely a general positive outlook.

← correlates with
Law of Narrative Gravity

The tendency for new information to be pulled toward and assimilated into dominant existing narratives, distorting its interpretation to fit pre-existing stories.