{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/102803"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/102803","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The effect of lineup size on eyewitness identification accuracy","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Akan, Melisa"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Psychology","degree_department":null,"school":null,"contributors":["Benjamin, Aaron S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-02-07T20:36:00Z","date_published":"2019-02-07T20:36:00Z","updated_at":"2026-07-22T22:24:42Z","subjects":["Eyewitness memory, lineup size, ROC analysis"],"languages":["en"],"rights":["Copyright 2018 Melisa Akan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/102803","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Benjamin, Aaron S."]},{"key":"dc:creator","label":"Author","values":["Akan, Melisa"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-02-07T20:36:00Z","2021-02-08T10:15:11Z","2018-11-29","2018-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Psychology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Eyewitness memory, lineup size, ROC analysis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Melisa Akan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/102803"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01","The student, Melisa Akan, accepted the attached license on 2018-11-24 at 13:45.","The student, Melisa Akan, submitted this Thesis for approval on 2018-11-24 at 13:56.","This Thesis was approved for publication on 2018-11-29 at 13:06.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13111 on 2019-02-07 at 14:18:00","Made available in DSpace on 2019-02-07T20:36:00Z (GMT). No. of bitstreams: 3 AKAN-THESIS-2018.pdf: 565892 bytes, checksum: 14b1ef591521d07d74f02fc762686725 (MD5) MS.Thesis.Akan.2018.docx: 635026 bytes, checksum: 99c852146c9356c2c0ad0e91ca0a0122 (MD5) LICENSE.txt: 4208 bytes, checksum: e2415fda3a0aff9f103df5c877231fac (MD5) Previous issue date: 2018-11-29","Embargo set by: Seth Robbins for item 109827 Lift date: 2021-02-07T20:36:09Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 109827 Lift date: 2021-02-07T20:39:46Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 109827 Lift date: 2021-02-07T20:44:35Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 109827 on 2021-02-08T10:15:11Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The effect of lineup size on eyewitness identification accuracy"]}]}],"canonical_facts":{"dc:contributor":["Benjamin, Aaron S."],"dc:creator":["Akan, Melisa"],"dc:date":["2019-02-07T20:36:00Z","2021-02-08T10:15:11Z","2018-11-29","2018-12"],"dc:description":["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.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01","The student, Melisa Akan, accepted the attached license on 2018-11-24 at 13:45.","The student, Melisa Akan, submitted this Thesis for approval on 2018-11-24 at 13:56.","This Thesis was approved for publication on 2018-11-29 at 13:06.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13111 on 2019-02-07 at 14:18:00","Made available in DSpace on 2019-02-07T20:36:00Z (GMT). No. of bitstreams: 3 AKAN-THESIS-2018.pdf: 565892 bytes, checksum: 14b1ef591521d07d74f02fc762686725 (MD5) MS.Thesis.Akan.2018.docx: 635026 bytes, checksum: 99c852146c9356c2c0ad0e91ca0a0122 (MD5) LICENSE.txt: 4208 bytes, checksum: e2415fda3a0aff9f103df5c877231fac (MD5) Previous issue date: 2018-11-29","Embargo set by: Seth Robbins for item 109827 Lift date: 2021-02-07T20:36:09Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 109827 Lift date: 2021-02-07T20:39:46Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 109827 Lift date: 2021-02-07T20:44:35Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 109827 on 2021-02-08T10:15:11Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/102803"],"dc:language":["en"],"dc:rights":["Copyright 2018 Melisa Akan"],"dc:subject":["Eyewitness memory, lineup size, ROC analysis"],"dc:title":["The effect of lineup size on eyewitness identification accuracy"],"dc:type":["text"],"thesis:degree_discipline":["Psychology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:42Z"}