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Repeated interrogations – Stretching the deception detection paradigm

Artikel i vetenskaplig tidskrift
Författare Pär-Anders Granhag
Leif Strömwall
Publicerad i Expert Evidence
Volym 7
Sidor 163-174
Publiceringsår 1999
Publicerad vid Psykologiska institutionen
Sidor 163-174
Språk en
Ämnesord Deception detection, reat vs reconstruct hypothesis, consistency heuristic
Ämneskategorier Psykologi

Sammanfattning

In real life, suspects are often subjected to repeated interrogations. Psycho-legal research on deception has neglected this fact. To remedy this mismatch a series of studies was conducted mapping how repeated interrogations affect lie-catchers’ judgemental processes, deception detection performance, and meta-assessments. In two experiments we found that lie-catchers given access to consecutive statements from one suspect did not perform better than lie-catchers given access to one statement only. In addition, access to repeated interrogations inflated the lie-catchers’ confidence in the correctness of their veracity judgement, which had a detrimental effect on the accuracy-confidence relation. As the basis for assessing veracity was changed from one to several statements the lie-catchers, to a large extent, seemed to trust the ‘consistency heuristic’. The assumption underlying this heuristic is that inconsistency implies deception and consistency implies truth. The data show that (a) people tend to disagree as to whether a particular set of consecutive statements is consistent or not, and (b) deceptive statements are at least equally consistent as truthful statements. In order to explain the latter finding a ‘repeat vs. reconstruct’ hypothesis was suggested, assuming that liars try to repeat their initial statement, whereas truth-tellers try to reconstruct a previously experienced event. The low predictive accuracy found for the ‘consistency heuristic’ strongly questions beliefs held by professional liecatchers, opinions expressed in the psycho-legal literature and recommendations found in applied interrogation manuals.

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