The study developed a novel analysis for quantifying item difficulty for participant groups and establishing group "winners" for items in conditions of interest. "Wisdom-of-the-crowds" effects were explored by fusing responses from varying numbers of participants to amplify strategic differences across groups. Results indicate that examiners used the internal face more effectively than untrained participants, but failed to exploit identity information in the external face and body. In addition, findings indicate that accuracy measures for examiners and controls must include both same-identity verifications and different-identity rejections to understand the role of perceptual skill and response bias in performance differences across participant groups. (publisher abstract modified)
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