Introducción judicial del polígrafo a través de la pericia psicológica forense a presuntos agresores sexuales / Introdução judicial do polígrafo através da perícia psicológica forense para supostos criminosos sexuais / Judicial introduction of the polygraph through expertise in forensic psychology for suspected sexual aggressors

Este documento reseña la experiencia del uso judicial del polígrafo como una de las técnicas de evaluación, dentro de la pericia psicológica en cinco procesos penales de delito sexual en Bogotá D.C., Colombia, y evidencia cómo se pudo introducir la psicofisiología forense al proceso judicial, aunque los jueces no necesariamente se adhieren a este criterio.

This document describes experiences in the legal use of the polygraph as an evaluation technique within the framework of psychological expertise in five criminal actions against sexual offense cases in Bogota, Colombia, and it evidences how forensic psychophysiology could be introduced in the judicial proceeding, although judges are not necessarily or particularly fond of this criterion.

Este documento descreve a experiência do uso judicial do polígrafo como uma das técnicas de avaliação, dentro da perícia psicológica, em cinco processos penais de crime sexual em Bogotá, D. C., Colômbia, e evidência de como poderia se introduzir a psicofisiologia forense ao processo judicial, embora os juízes necessariamente não se adiram a este critério.

Research on Guilty Knowledge Test (GKT) Paradigm and Its Variation / 中国临床心理学杂志

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.