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Lineup fairness: propitious heterogeneity and the diagnostic feature-detection hypothesis
Curt A Carlson1, Alyssa R Jones2, Jane E Whittington2
1Texas A&M University - Commerce, PO Box 3011, Commerce, TX, 75429, USA. curt.carlson@tamuc.edu.
Cognitive Research: Principles and Implications
|June 15, 2019
Summary
Simultaneous eyewitness lineups require varied suspect features for accurate identification. Homogenous lineups decrease accuracy, while description-matched fillers improve suspect identification, supporting propitious heterogeneity and diagnostic feature-detection.
Area of Science:
- Cognitive Psychology
- Forensic Science
- Eyewitness Identification Research
Background:
- Simultaneous lineups are theorized to require propitious heterogeneity to ensure accurate eyewitness identification.
- The diagnostic feature-detection (DFD) hypothesis predicts decreased discriminability with fewer distinguishing features between suspects and fillers.
- Previous research suggests lineup composition significantly impacts eyewitness accuracy.
Purpose of the Study:
- To empirically test the principles of propitious heterogeneity and the DFD hypothesis in eyewitness identification.
- To investigate how facial feature similarity and filler type affect lineup discriminability.
Main Methods:
- Experiment 1: Controlled similarity using artificial faces to assess feature homogeneity effects.
- Experiment 2: Employed an ecologically valid eyewitness identification paradigm with real-world scenarios.
- Measured empirical discriminability as a function of lineup composition.
Main Results:
- Empirical discriminability significantly decreased as facial features within lineups became more homogenous.
- Lineups utilizing description-matched fillers demonstrated higher empirical discriminability compared to suspect-matched fillers.
- Results support both propitious heterogeneity and the DFD hypothesis.
Conclusions:
- Lineup homogeneity negatively impacts eyewitness accuracy, underscoring the importance of varied facial features.
- Description-matched fillers are more effective than suspect-matched fillers in enhancing accurate identification.
- Findings provide empirical support for optimizing eyewitness identification procedures.
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