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Evolving and combining facial composites: Between-witness and within-witness morphs compared

Evolving and combining facial composites: Between-witness and within-witness morphs compared

Valentine, Tim, Davis, Josh P. ORCID: 0000-0003-0017-7159, Thorner, Kate, Solomon, Chris and Gibson, Stuart (2010) Evolving and combining facial composites: Between-witness and within-witness morphs compared. Journal of Experimental Psychology: Applied, 16 (1). pp. 72-86. ISSN 1076-898X (Print), 1939-2192 (Online) (doi:

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Student participant-witnesses produced 4 composites of unfamiliar faces with a system that uses a genetic algorithm to evolve appearance of artificial faces. Morphs of 4 composites produced by different witnesses (between-witness morphs) were judged better likenesses (Experiment 1) and were more frequently named (Experiment 2) by participants who were familiar with the target actors than were morphs of 4 composites produced by a single witness (within-witness morphs). Within-witness morphs were judged better likenesses and more frequently named than the best or the first-produced individual composites. The same results for likeness judgments were observed after possible artifacts in the comparison of between- and within-witness morphs were eliminated (Experiment 3). Experiment 4 showed that both internal and external features were better represented in morphs than in the original composites, although the representation of internal features improved more. The results suggest that morphing improves the representation of faces by reducing random error. Between-witness morphs yield more benefit than within-witness morphs by reducing consistent but idiosyncratic errors of individual witnesses. The experiments provide the first demonstration of an advantage for within-witness morphs produced using a single system. Experiment 2 provides the first demonstration of a reliable advantage for between-witness morphs in the most forensically relevant task: naming a composite of a familiar person produced by a witness who was unfamiliar with the target. Morphing would enhance the recognition of facial composites of criminals. Within-witness morphing provides a methodology for use in crimes in which the victim is the only witness. (PsycINFO Database Record (c) 2012 APA, all rights reserved).

Item Type: Article
Uncontrolled Keywords: facial, composite, identification, morph, witness
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Pre-2014 Departments: School of Health & Social Care
School of Health & Social Care > Applied Psychology Research Group
School of Health & Social Care > Department of Psychology & Counselling
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Last Modified: 14 Oct 2016 09:13
Selected for GREAT 2016: None
Selected for GREAT 2017: None
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