| 1. |
- Granhag, Pär-Anders, 1964, et al.
(författare)
-
Partners in Crime: How Liars in Collusion Betray Themselves
- 2003
-
Ingår i: Journal of Applied Social Psychology. - : Wiley-Blackwell Publishing, Inc.. - 0021-9029 .- 1559-1816. ; 33:4, s. 848-868
-
Tidskriftsartikel (refereegranskat)abstract
- The paradigmatic task for participants in studies on deception is to assess veracity on the basis of a single statement. However, in applied contexts, lie catchers are often faced with multiple statements (reported by one or several suspects). To appreciate this mismatch, we conducted a study where each member of 10 truth-telling pairs and 10 lying pairs (reporting fabricated alibis) was interrogated twice about an alibi. As predicted, lying pair members were more consistent between themselves than were truth-telling pair members, and single liars and truth tellers were equally consistent over time. Furthermore, truth tellers made more commissions than did liars. Although in line with our repeat vs. reconstruct hypothesis, these findings contrast sharply with beliefs held by professional lie catchers and recommendations found in literature on deception detection. The results are translated into an applied psycholegal context.
|
|
| 2. |
|
|
| 3. |
|
|
| 4. |
- Granhag, Pär-Anders, 1964, et al.
(författare)
-
Deception Detection: Interrogators’ and Observers’ Decoding of Consecutive Statements
- 2001
-
Ingår i: The journal of psychology - Interdisciplinary and applied. - 0022-3980. ; 135:6, s. 603-620
-
Tidskriftsartikel (refereegranskat)abstract
- This study is an examination of two forensically important but previously neglected issues in interpersonal deception. First, which cues do lie catchers—who have access to repeated interrogations—pay attention to in order to detect deception? Second, do face-to-face interacting interrogators differ from noninteracting observers in terms of how they perceive a suspect? After watching a staged event, 24 suspects (12 liars and 12 truth tellers) were interrogated three times over a period of 11 days. After the final interrogation, the veracity of each suspect was assessed by his or her interrogator and by 6 observers who had watched the interrogations on video only. The results of the experiment showed that consistency over time was by far the most commonly used cue for justifying veracity judgments. Critically, the predictive accuracy for this cue was alarmingly low. As opposed to results from previous research, the interrogators used verbal cues to a significantly greater extent than did the observers. Furthermore, a probing effect was shown (i.e., probed suspects were perceived as significantly more honest than nonprobed suspects). Finally, limited support for a previously reported honesty effect was obtained (i.e., that interrogators perceive suspects to be more honest than do observers).
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
- Granhag, Pär-Anders, 1964, et al.
(författare)
-
Imprisoned knowledge: Criminals' beliefs about deception.
- 2004
-
Ingår i: Legal and Criminological Psychology. - 2044-8333. ; 9
-
Tidskriftsartikel (refereegranskat)abstract
- This paper is a survey examining beliefs about cues to deception held by prison inmates, prison personnel and students. In line with the ideas about more beneficial learning structures in the environment of criminals and findings from previous studies, we predicted that the beliefs held by prison inmates would be most consistent with the general pattern found in studies examining objective cues to deception. A total of 326 participants filled out a questionnaire containing questions about cues to deception. The sample consisted of 107 prison inmates from high-security prisons, 103 prison personnel and 116 students. Both between-group and within-group analyses were conducted. In line with previous surveys, students and prison personnel held stereotypical and wrongful beliefs about cues to deception. Prison inmates' beliefs about deception were less stereotypical than the beliefs of prison personnel and students.The results indicate that prison inmates have relatively more insight into the psychology of deception. A reasonable explanation for these findings is that the environment of criminals is beneficial in the sense that they receive more adequate outcome feedback than the other two groups. The results indicate that studying this group may generate useful knowledge about the dynamics of deception.
|
|
| 8. |
- Granhag, Pär-Anders, 1964, et al.
(författare)
-
Police officers lie detection accuracy: Interrogating freely versus observing video
- 2004
-
Ingår i: Police Quarterly. ; :7, s. 429-456
-
Tidskriftsartikel (refereegranskat)abstract
- The study investigated experienced police officers (N = 30) lie detection accuracy. Each police officer conducted an interrogation of a college student acting as a suspect either guilty or innocent of a mock crime, and made a veracity judgment of the suspect. The police officers had the opportunity to conduct the interrogation in the manner of their own choice. The lie detection accuracy of these police officers was compared to that of police officers judging video-taped versions of the interrogations. The police officers failed to perform detect deception better than chance. There was no difference in accuracy between police officers interrogating live and observing video. The interrogators reported to rely on verbal content more when interrogating than when watching video. It seems as if police officers have a difficult time detecting deception not only in passive contexts but also in active ones
|
|
| 9. |
- Granhag, Pär-Anders, 1964, et al.
(författare)
-
Repeated Interrogations: Verbal and Non-verbal Cues to Deception
- 2002
-
Ingår i: Applied Cognitive Psychology. - 0888-4080 .- 1099-0720. ; 16, s. 243-257
-
Tidskriftsartikel (refereegranskat)abstract
- The major aim of this study was to investigate to what extent verbal and non-verbal features of liars’ and truth-tellers’ behaviour change during the course of repeated interrogations. After seeing a staged event, 24 suspects (12 liars and 12 truth-tellers) were interrogated three times over a period of 11 days. In terms of the non-verbal features, and in line with our prediction, we found that the liars displayed significantly fewer smiles, self-manipulations, pauses, and less gaze aversion than truthtellers. Furthermore, over time the initial differences between liars’ and truth-tellers’ non-verbal behaviour increased for smiles, gaze aversion and pauses. In addition, we found that the cue ‘richness of detail’—the most indicative verbal marker for truth as given in previous research—had no discriminative power at any of the interrogation sessions. Finally, and in contrast to beliefs held by supposed expert lie-catchers (e.g. judges and police officers), truthful and deceptive statements were found to be equally consistent over time. The psycho-legal implications of the above findings are discussed.
|
|
| 10. |
- Granhag, Pär-Anders, 1964, et al.
(författare)
-
Research on deception detection: Intersections and future challenges.
- 2004
-
Ingår i: The detection of deception in forensic contexts. / Granhag, P.A. & Strömwall, L.A.. - Cambridge : Cambridge University Press.. ; , s. 317-330, s. 317-330
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In this chapter (concluding the volume) we acknowledge three main intersections in terms of deception detection research; a) the effects of combining different lie detection methods, b) implicit lie detection, and c) the importance of motivation, practice and feedback for enhancing professionals' lie detection accuracy. We also highlight a number of future challenges for research on deception; for example liars' and truth tellers' strategies, strategic disclosure of evidence and individual characteristics of expert lie-catcher; cross-cultural aspects of deception, deception and electronic media and developing of a more solid and coherent theoretical platform
|
|
