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Misinformation Effect

Also Known As: Post-Event Information Effect Memory Conformity
Cognitive Bias ID: misinformation_effect

Definition

The misinformation effect occurs when a person's recall of an event is altered by exposure to misleading information presented after the event occurred. Post-event information becomes integrated into the original memory, making it nearly impossible to distinguish what was actually witnessed from what was suggested later. This effect demonstrates the reconstructive and malleable nature of human memory.

Examples

A witness to a car accident sees a blue car, but after a detective asks 'How fast was the green car going?', the witness later recalls the car as green, genuinely believing this was their original perception.

After watching a news segment that repeatedly describes a protest as 'violent riots,' viewers who originally witnessed only minor scuffles in live footage later recall seeing widespread destruction and aggression that never actually occurred.

A friend asks someone, 'Remember how drunk Sarah got at that party?' The person being asked actually has no memory of Sarah being particularly drunk, but later genuinely recalls Sarah as having been visibly intoxicated that evening.

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

    Has the person been exposed to information about an event after it occurred?

    Type: binary
  2. 2

    Is the post-event information inaccurate or misleading?

    Type: binary
  3. 3

    Has the person's memory of the original event been altered to incorporate the misleading information?

    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.

Hierarchical Context