Lineup position affects guessing-based selection but not culprit-presence detection in simultaneous and sequential...

Area of Science:

• Cognitive Psychology
• Forensic Psychology
• Eyewitness Identification

Background:

• Eyewitness identification is crucial in criminal investigations.
• The two-high threshold model explains eyewitness decision-making.
• Lineup procedures may influence identification accuracy.

Purpose of the Study:

• To investigate the impact of lineup position on cognitive processes in eyewitness identification.
• To examine how detection and non-detection processes are affected by suspect placement.
• To differentiate between recognition-based and guessing-based selections in lineups.

Main Methods:

• Two experiments utilized large sample sizes (N=2586 and N=2581) with random assignment of culprits and innocent suspects.
• Experiment 1 analyzed simultaneous photo lineups; Experiment 2 analyzed sequential lineups.
• The study measured detection accuracy and guessing-based selection across all lineup positions.

Main Results:

• Lineup position did not influence the detection of the culprit's presence.
• Guessing-based selection varied significantly with lineup position.
• Participants were more likely to select a lineup member in the first position based on guessing.

Conclusions:

• The first position in a lineup is susceptible to guessing, independent of actual recognition.
• Findings support avoiding the placement of the primary suspect in the first lineup position.
• This procedural adjustment may reduce erroneous identifications based on guessing.