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Eye-Witness Testimony: Reliability and Justice

The Foundations of Testimony

Why this matters

Eye-witness testimony involves individuals recalling and reporting what they have seen or experienced. It is often critical in legal settings, but its reliability is a major focus in psychology due to frequent inaccuracies and distortions. This debate considers whether eye-witness accounts, especially from children, can be trusted, the psychological processes underlying memory, and implications for justice and society.

The Limits of Human Memory

Memory ≠ Perfect Recording Device
The core issue is that human memory is not a perfect recording device. Memory construction is influenced by perception, encoding, storage, and retrieval processes, all vulnerable to errors and biases. Psychologists distinguish between accuracy (factual correctness) and confidence, which often do not correlate strongly.

The Power of Suggestion

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The Impact of Post-Event Information: Classic studies by Loftus and Palmer (1974) highlighted how post-event information can distort memory. Participants’ estimates of car speed varied depending on whether they heard the word “hit” or “smashed” in questions after viewing a crash video. This demonstrated leading questions can implant false memories or alter recollections.

Children's Testimony Reliability

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Value and NecessityYet, children’s testimony is invaluable in many cases, especially in abuse investigations.
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Vulnerability to ErrorsChildren’s eye-witness testimony is particularly vulnerable due to less developed memory and language skills, greater suggestibility, and social compliance. Studies by Ceci and Bruck (1993) showed that repeated questioning, use of misleading information, or pressure can lead children to form inaccurate or fabricated memories.

Ethical & Judicial Progress

Ethically, the risk of wrongful convictions due to inaccurate testimony demands careful handling. Courts have introduced special measures for child witnesses, such as:

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Videotaped Interviews

To reduce stress and suggestibility.
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Support Persons

Provided to aid child witnesses in court.

Key Explanatory Theories

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Memory conformity

Occurs when witnesses discuss events, influencing each other's recollections.
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Stress and anxiety

Can impair accurate encoding of events.
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Weapon focus effect

The presence of a threatening weapon narrows attention, reducing peripheral memory.
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Source monitoring errors

Involve mistaking imagined or suggested events for real memories.

Enhancing Accurate Recall

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The Cognitive Interview: Psychologists recommend protocols like the Cognitive Interview (Geiselman et al., 1985) to enhance accurate recall by encouraging witnesses to mentally recreate context, report everything, and recall events in different orders or from perspectives.

Corroboration and Experts

There are economic implications: reliance on faulty eye-witness accounts can cause costly miscarriages of justice. We must balance utility and risk.

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How should courts use testimony given its limitations?
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It should always be corroborated with physical evidence. In court, jurors may overestimate reliability, so expert testimony about eye-witness limitations is increasingly common.
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Eye-Witness Testimony Deck
Term
Eye-Witness Testimony

What is eye-witness testimony?

Answer
Definition

A person’s account of what they saw or experienced, often used in legal settings.

Term
Unreliability

Why is eye-witness testimony considered unreliable?

Answer
Explanation

Memory is prone to errors, distortions, and biases during encoding, storage, and retrieval.

Term
Classic Study

Who conducted the classic 1974 study on post-event information's effect?

Answer
Researchers

Loftus and Palmer.

Term
Study Findings

What did Loftus and Palmer’s study demonstrate?

Answer
Conclusion

That leading questions can alter memory and implant false details.

Term
Child Testimony Vulnerability

Why is children’s eye-witness testimony especially vulnerable?

Answer
Reasons

Due to immature memory, suggestibility, language skills, and social compliance.

Term
Court Protection Measures

What are some court measures used to protect child witnesses?

Answer
Examples

Videotaped interviews and support persons.

Term
Weapon Focus Effect

What effect describes narrowed attention due to a weapon during an event?

Answer
Effect

Weapon focus effect.

Term
Memory Conformity

What is memory conformity?

Answer
Definition

When witnesses influence each other's memories through discussion.

Term
Recall Improvement

Name a technique to improve accurate recall in witnesses.

Answer
Technique

The Cognitive Interview.

Term
Corroboration

Why should eye-witness testimony be corroborated?

Answer
Reason

To avoid wrongful convictions caused by faulty memories.

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🕵️ Eye-Witness Testimony Quiz

1. What did Loftus and Palmer’s 1974 study reveal about eye-witness memory?

Their study showed wording like “hit” vs. “smashed” influenced speed estimates, showing memory distortion.

2. Which factor does not commonly affect eye-witness accuracy?

Eye color doesn’t influence memory accuracy; the others are recognized psychological factors.

3. True or False: Children’s testimony is always less reliable due to suggestibility.

While children are more suggestible, their testimony can be crucial and accurate, especially with proper procedures.

4. What is one method used in courts to reduce suggestibility in child witnesses?

These recordings reduce pressure and help preserve accurate testimony.

5. Which interviewing technique helps enhance the accuracy of eye-witness memory?

It encourages detailed, varied recall to improve accuracy.

📊 Results

  • Notes and Quiz
  • Psychology
  • AS & A Level
  • Positive Psychology
  • WJEC