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The Korean Journal of Cognitve & Biological Psychology - Vol. 33, No. 3

[ Original Article ]
The Korean Journal of Cognitve & Biological Psychology - Vol. 33, No. 3, pp.201-220
Abbreviation: KCBPA
ISSN: 1226-9654 (Print)
Print publication date 30 Jul 2021
Received 20 Jan 2021 Revised 22 Jul 2021 Accepted 25 Jul 2021
DOI: https://doi.org/10.22172/cogbio.2021.33.3.007

정보 노출 상황에서의 P300-기반 숨김정보검사
황슬기 ; 김영윤
경기대학교 범죄심리학과

The P300-based Concealed Information Test in the situation of Information Leakage
Seul Ki Hwang ; Young Youn Kim
Department of Forensic Psychology, Kyonggi University
Correspondence to : 김영윤, 경기대학교 일반대학원 범죄심리학과, (16227) 경기도 수원시 영통구 광교산로 154-42 E-mail: youngy@kgu.ac.kr


ⓒ The Korean Society for Cognitive and Biological Psychology

초록

본 연구는 정보 노출에 대한 P300-기반 숨김정보검사의 한계점을 극복하고자 허위정보(misleading information)와 문장을 사용하여 실험을 진행하였다. 허위정보는 피험자에게 범죄와 관련되어 있다고 고의로 노출시킨 정보로, 실제로는 범죄와 관련이 없는 정보를 의미한다. 피험자는 크게 모의 범죄를 수행함으로써 범죄관련정보를 습득하거나(유죄집단, n=58), 모의 범죄를 설명한 동영상을 시청함으로써 범죄관련정보를 습득하는(정보노출-무죄집단, n=53) 두 개의 집단으로 나누어졌다. 각 집단은 다시 뇌파 검사가 진행되기 전에 허위정보에 노출되는 지에 따라 통제조건, 한 개의 허위정보에 노출되는 조건, 두 개의 허위정보에 노출되는 조건의 세 가지 조건으로 분류되었다. 뇌파검사가 진행되는 동안 주어/목적어/동사 구조의 문장이 자극으로 제시되었다. 유죄집단은 목적어와 서술어에서 허위정보 조건에 상관없이 탐침자극과 무관련자극 간에 유의미한 P300 진폭 차이가 나타났다. 정보노출-무죄집단의 경우 목적어와 서술어에 대해 통제조건에서만 탐침자극에 대한 높은 P300 진폭이 나타났으며, 허위정보에 노출되었을 때에는 탐침자극의 P300 진폭이 감소하였다. 본 연구의 결과는 허위정보가 P300-기반 숨김정보검사에서 정보노출-무죄집단에 대한 허위긍정오류(false positive)를 감소시키는데 효과적임을 나타내며, 허위정보의 개수가 증가하여도 효과적임을 보여준다.

Abstract

This study investigated the method resistant to information leakage in P300-based concealed information test using misleading information and Korean sentences. The misleading information is intentionally introduced to participants as a crime-related item. Participants acquired crime-related knowledge either by committing mock crime (guilty group, n=58) or watching a video that describes a mock crime (informed-innocent group, n=53). Each group was divided into three conditions by exposing to misleading information before the concealed information test : control, 1-misleading information, 2-misleading information. During the concealed information test, the sentence stimuli were presented in subject-object-verb order. There was a significant difference in P300 amplitude between the probe and irrelevant stimuli for object and verb elements regardless of misleading information condition in the guilty group. In the informed-innocent group, the probe stimulus elicited larger P300 amplitude compared to irrelevant stimuli for object and verb elements only in the control condition, but not in the 1-misleading information and 2-misleading information condition. These results suggest that the misleading information in the P300-based concealed information test is effective in reducing false positive outcomes of informed-innocents, even that the number of misleading information increases.


Keywords: Concealed Information Test, P300, misleading information, constituent of sentence, CIT effect
키워드: 숨김정보검사, 정보노출, 허위정보, 문장 분석

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