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The present experiments focus on whether the post‐identification feedback effect can be reduced by providing participants with warnings. Participants viewed a crime on video and identified a suspect from a target‐absent lineup (Experiment 1) or target‐present lineup (Experiment 2). Participants then received positive feedback, negative feedback or no feedback. Half of the participants received a warning saying their feedback was randomly generated by the computer, and the other half received no warning. Robust post‐identification feedback effects were observed in both experiments in the no warning condition. These effects were largely eliminated when participants received a warning. In Experiments 3 and 4, we failed to find an ameliorative effect of a forensically realistic warning. These results indicate that warnings can reduce the effect of post‐identification feedback in principle, but the application of warnings in practice may be more difficult.
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Lampinen et al. (2006) studied this question.
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