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A perceptual scaling approach to eyewitness identification
Sergei Gepshtein1,2, Yurong Wang3,4, Fangchao He3,5
1Center for the Neurobiology of Vision, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA, 92037, USA. sergei@salk.edu.
Nature Communications
|July 16, 2020
Summary
Eyewitness misidentification is a major cause of wrongful convictions. This study introduces a new lineup procedure that accurately measures memory strength, reducing identification bias and improving accuracy.
Area of Science:
- Forensic Psychology
- Cognitive Psychology
- Memory Research
Background:
- Eyewitness misidentification contributes to 70% of wrongful convictions.
- Traditional identification lineups confound memory strength and decision criteria.
- Existing methods lack a reliable measure of eyewitness memory independent of bias.
Purpose of the Study:
- To develop a novel eyewitness identification procedure.
- To independently measure memory strength and decision criteria.
- To provide a quantitative index of eyewitness performance.
Main Methods:
- Utilized perceptual scaling and signal detection analysis.
- Developed a lineup procedure to estimate memory strength.
- Quantified classifier performance in distinguishing perpetrators from innocent suspects.
Main Results:
- The new lineup allows for memory strength estimation independent of decision bias.
- Revealed memory structures previously inaccessible with traditional lineups.
- Yielded a quantitative index for individual eyewitness performance.
Conclusions:
- The proposed lineup procedure enhances the accuracy of eyewitness identifications.
- This method offers a more reliable assessment of eyewitness memory.
- Reduces the impact of decision bias on identification accuracy.
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