Research on Guilty Knowledge Test (GKT) Paradigm and Its Variation
- VernacularTitle:犯罪知识测试(GKT)测谎模式及其变式的实验研究
- Author:
Genyue FU
;
Yan MA
;
Wei MIAO
- Publication Type:Journal Article
- Keywords:
Lie detection;
Guilty Knowledge Test;
Lykken scoring method;
Polygraph
- From:Chinese Journal of Clinical Psychology
2000;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To confirm the cognitive rationale of Guilty Knowledge Test (GKT) with a polygraph lie-detection test,explore the merits of GKT's variation as narrowing unclear range of guilty knowledge, and to discuss the problems of the commonly used scoring method which was introduced by Lykken initially in order to obtain more scientific scoring method in accordance with the cognitive rationale. Methods:40 college students were chosen as participants.The study was designed under non-motivational instructions and neutral materials of meaningless letter strings. Results: The lie detection accuracy of this research was 73% under standard GKT paradigm (namely, the tester knowing the guilty knowledge clearly) with the scoring method introduced by Lykken, which confirmed the cognitive rationale of GKT. The accuracy of reducing guilty knowledge range from 5 to 2 was 78.4% in the condition of unclear-clue GKT (namely, the tester only knowing the guilty knowledge in the range of five items) with the scoring method of height and vicinity.Conclusion: The accuracy of lie detection with standard GKT in this study is similar to top accuracies of foreign studies with the same pattern and verified the rationale of cognition for GKT. The innovative scoring method suggested in this paper bears merits in application and is worth further studying.
