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Witnesses sometimes refuse to identify a culprit to police (due to fear or allegiance) or may be physically unable. Lefebvre et al. (2007, 2009) applied the P300-based Guilty Knowledge Test to eyewitness identification. We tested a replication of Lefebvre and colleagues’ findings with our own materials. Participants were shown a crime video twice to maximize exposure. Then, they studied a new face to a criterial recognition performance. These two faces were later repeatedly presented intermixed with ten new faces in an oddball paradigm. We instructed half of participants to “lie” by not identifying the culprit overtly. Groupwise P300 amplitudes to the criminal were compared to amplitudes to the studied face and to the new faces to classify amplitudes to the criminal’s face as identifications or rejections.
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