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Elicit cues to deception: The effects of different evidence disclosure tactics

Conference paper
Authors Pär-Anders Granhag
Leif Strömwall
Rebecca M. Willén
Maria Hartwig
Published in The 8th meeting of the Nordic Network for research on Psychology and Law (NNPL), Oslo, Norway, September 16-17, 2011.
Publication year 2011
Published at Department of Psychology
Language en
Keywords Rättspsykologi, Lögndetektion, Polisförhör, Brottsutredningar
Subject categories Applied Psychology

Abstract

Research on real-life interviews with suspects shows that disclosure of evidence is a very common tactic and that it can occur in all phases of the interview. It is therefore rather remarkable that there is very little research on the effectiveness of different disclosure tactics (by effectiveness we refer to the number and strength of cues that discriminate between truth and deception). Hence, the aim of the present study was to examine the effects of three different disclosure tactics with respect to one single piece of evidence: presenting the evidence early and two versions of late presenting of the evidence (Strategic Use of Evidence; SUE). A mock-theft scenario was employed with 195 participants who were randomly allocated to one of six conditions: guilty or innocent suspects interviewed with one of the three tactics. We found that both when and how the evidence is disclosed is related to effectiveness of interview tactic. First, with respect to when we found that it was more effective to disclose the evidence late (vs. early) in the interview. Second, with respect to how we found that it was more effective to disclose the evidence in a stepwise (vs. direct) manner. Disclosing the evidence late and in a stepwise manner resulted in two strong cues to deception (statement-evidence inconsistency and within-statement inconsistency), lending further and new support to the SUE-technique.

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