The effect of lineup size on eyewitness identification accuracy
Akan, Melisa
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https://hdl.handle.net/2142/102803
Description
Title
The effect of lineup size on eyewitness identification accuracy
Author(s)
Akan, Melisa
Issue Date
2018-11-29
Director of Research (if dissertation) or Advisor (if thesis)
Benjamin, Aaron S.
Department of Study
Psychology
Discipline
Psychology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Eyewitness memory, lineup size, ROC analysis
Abstract
Eyewitness identification via lineup procedures is an important and widely used source of evidence in criminal cases. However, the current scientific literature provides inconsistent guidance on a very basic question of lineup procedure: lineup size. Some of the ambiguity in the field may be due to different ways in which performance in a lineup memory task is assessed, many of which conflate choosing rate (response bias) with actual memory (discriminability). In two experiments, we examined whether the number of fillers presented with a suspect affects diagnostic accuracy in a lineup, as assessed with Receiver Operating Characteristic (ROC) analysis. Experiment 1 used a between-subject design (N=4401) with one video and lineup per subject. Experiment 2 used a within-subjects (N=105) design with 60 still photographs. For both experiments, showups—a lineup without any fillers—led to lower discriminability than standard lineups with six members. However, in neither experiment did the number of fillers affect discriminability.
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