An evaluation of lineup presentation,weapon presence,and a distinctive feature using ROC analysis |
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| Institution: | 1. Department of Psychology, University of California, San Diego, United States;2. Department of Psychology, Royal Holloway, University of London, United Kingdom;1. Department of Psychology, Edge Hill University, Ormskirk, Lancashire L39 4QP, UK;2. School of Psychology, University of Leicester, Leicester LE1 9HN, UK;1. University of Oklahoma, Norman, OK 73019-2007, United States;2. Texas A&M University-Commerce, Commerce, TX 75429, United States;1. Queen''s University, Canada;2. University of Winnipeg, Canada;3. University of Portsmouth, United Kingdom;4. Maastricht University, Netherlands;1. Department of Psychology, University of California, San Diego, United States;2. Department of Psychology, Royal Holloway, University of London, United Kingdom |
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| Abstract: | We conducted an experiment (N = 2675) including both laboratory and online participants to test hypotheses regarding important system and estimator variables for eyewitness identification. Simultaneous lineups were compared to sequential lineups with the suspect presented early versus late because there is evidence that suspect position could be an important factor determining a simultaneous versus sequential advantage in guilty-innocent suspect discriminability. We also manipulated whether or not the perpetrator held a weapon or had a distinctive feature on his face, to re-evaluate recent evidence that these factors interact. Overall, the simultaneous lineup yielded higher discriminability than the sequential lineup, and there was no effect of sequential position. Discriminability was higher when the perpetrator had no weapon, but only when no distinctive feature was present. We conclude with a discussion of the importance of exploring interactions between system and estimator variables using Receiver Operating Characteristic (ROC) analysis. |
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| Keywords: | Eyewitness identification Receiver Operating Characteristic analysis Simultaneous and sequential lineups Weapon effect Distinctive feature |
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