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Motivational bias in criminal investigators’ judgments of witness reliability

Artikel i vetenskaplig tidskrift
Författare Karl Ask
Pär-Anders Granhag
Publicerad i Journal of Applied Social Psychology
Volym 37
Nummer/häfte 3
Sidor 561-591
Publiceringsår 2007
Publicerad vid Psykologiska institutionen
Sidor 561-591
Språk en
Ämnesord motivational bias; criminal investigators; judgment; witness reliability; time pressure; cognitive closure; hypothesis
Ämneskategorier Psykologi

Sammanfattning

An experiment was conducted where experienced criminal investigators (N = 49) evaluated the testimony of a witness who either confirmed or disconfirmed the focal hypothesis in a homicide case. Participants’ motivation to perpetuate the hypothesis was manipulated by varying the need for cognitive closure via time pressure. The hypothesis-inconsistent witness was perceived as less reliable and credible, although its background and witnessing conditions were identical to those of the hypothesis-consistent witness. While this asymmetrical skepticism was not moderated by time pressure, participants under high (vs. low) time pressure were less inclined to adjust their confidence in the hypothesis in line with the witness testimony. Discussion focuses on implications for criminal investigations and theoretical contributions to investigative psychology

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