University of Twente Student Theses


Leugendetectie: het effect van mimicry op deceptie detectie

Leusen, Esther van (2012) Leugendetectie: het effect van mimicry op deceptie detectie.

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Abstract:Main goal of this study was to gain more knowledge of mimicry when detecting deception during an interrogation. A previous study of Stel, Van Dijk and Olivier (2009) about the effects of mimicry was used as starting point. Stel et al. (2009) determined that mimicry interfered deception detection, because the questioner is more influenced negatively by misleading nonverbal cues of the liar. The expectation was if mimicry is suppressed, the questioner is more able to detect deception than when mimicry is applied. In addition it is studied whether an observer is more able to detect this deception than the interrogator. It was expected that, from an emotional point of view, the observer would be less affected by possible misleading non verbal communication of the liar. The expectations are tested in a ‘2 Deception (student A truth versus lying) × 3 Mimicry (student B: mimicry versus no mimicry versus the blind controllable situation) design’ during 63 sets of interrogation between two students and a third observer behind a one-way mirror. After every interrogation both interrogator and observer estimated the deception and emotion showed by the surveyed student. The results show that an observer, someone who does not participate in the interrogation itself, is more able to detect deception than the interrogator. Results show also that students who are instructed to lie experience a slightly higher level of anxiety than when instructed to tell the truth. The results from the study of Stel et al. (2009) could not be replicated; the expectation that an interrogator is more able to detect deception when mimicry is suppressed then when applied, could not be confirmed. In addition, no difference was found for the influence of mimicry on the quality of the contact between the two students. The implications of this research and the recommendations for future research are discussed.
Item Type:Essay (Master)
Faculty:BMS: Behavioural, Management and Social Sciences
Subject:77 psychology
Programme:Psychology MSc (66604)
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