Misinformation Effect
Information encountered after an event can sometimes influence how people later recall that event.
After witnessing a traffic incident, a person hears someone describe a vehicle as speeding. That later wording may become entangled with the person's own recollection.
A witness is asked, ‘How fast was the car going when it sped past?’ The wording assumes speed; a neutral invitation to describe what happened leaves the witness more room to report their own recollection.
The misinformation effect describes how information encountered after an event can sometimes influence later memory reports about it.
A leading question, repeated discussion, or confident retelling can introduce details that were not noticed clearly at the time.
Memory is reconstructive, but that does not mean every recollection is false. A later influence is a possibility to consider, not a verdict about a specific witness.
Eyewitness testimony deserves careful treatment. A witness may accurately remember important parts while remaining uncertain about others, just as any person's recall can vary.
Several friends discuss an event before writing separate accounts. Later descriptions may influence what each person recalls, but that possibility does not prove any account false or show which details changed.
The way a question is asked can matter. Open prompts that invite a person to describe what they recall may avoid supplying details for them.
A person's confidence can be sincere, yet confidence alone does not establish accuracy or inaccuracy. Context and corroborating evidence may also matter.
When collecting accounts, record wording, timing, and prior exposure to other descriptions. Avoid pressuring someone to fill gaps or adopt a suggested detail.
If your own memory is involved, separate what you directly recall from what you later heard, read, or inferred.
Careful questions protect the quality of an account without dismissing the person giving it.
Psychological perspective
Recall involves rebuilding an event from available traces, and later information can sometimes become part of that reconstruction. The process varies across people and circumstances.
This effect warrants care in interviewing; it does not invalidate testimony or diagnose a witness. A fallible memory is not proof that a particular memory is false.
Thinking clearly
Use open, neutral questions and record a person's words as closely as possible before discussing interpretations.
Document when the account was given and what descriptions the person encountered beforehand, without assuming exposure changed the memory.
Consider corroborating evidence and uncertainty respectfully. Do not treat either confidence or the possibility of influence as a shortcut to a verdict.
How can we ask about a difficult event in a way that respects the witness and avoids supplying a memory?