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The not‐sure response option in sequential lineup practice
Author(s) -
Steblay Nancy K.,
Phillips Jonathan D.
Publication year - 2010
Publication title -
applied cognitive psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.719
H-Index - 100
eISSN - 1099-0720
pISSN - 0888-4080
DOI - 10.1002/acp.1755
Subject(s) - psychology , culprit , witness , eyewitness identification , social psychology , cognitive psychology , law , data mining , psychiatry , computer science , relation (database) , myocardial infarction , political science
Field implementation of double‐blind sequential lineups has prompted a question about the impact on eyewitness decisions of an explicit not‐sure response option. In this laboratory study, a video crime was viewed by 378 participants who then attempted to identify the culprit from a six‐person sequential or simultaneous‐format lineup that either included or did not include the culprit. Witnesses were provided either dichotomous forced‐choice (FC) response categories ( yes / no ) or a not‐sure option as one of three response categories ( yes / no / not‐sure ). The not‐sure option (NSO) significantly decreased witness choosing compared to the FC condition but only for sequential lineups. Both correct identifications and false alarms decreased. Diagnosticity was greatest for a sequential lineup with a NSO. The results suggest a criterion decision shift for witnesses who view a sequential lineup with a not‐sure response option. Copyright © 2010 John Wiley & Sons, Ltd.