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Korean Journal of Psychology: General

ISSN : 1229-067X

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Vol.28 No.2

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Validity of the basic assumption underlying the comparison question technique(CQT) for forensic lie detection

Korean Journal of Psychology: General / Korean Journal of Psychology: General, (P)1229-067X; (E)2734-1127
2009, v.28 no.2, pp.471-484


& (2009). Validity of the basic assumption underlying the comparison question technique(CQT) for forensic lie detection. Korean Journal of Psychology: General, 28(2), 471-484.

Abstract

Comparison Question Technique (CQT) is the method of forensic lie detection that is the most widely used in Korea. CQT is based on the basic assumption that the psychophysiological responses vary depending on whether the subject receives a relevant or a comparison question and whether the subject is telling a lie or the truth. The present study tested the basic assumption underlying the use of CQT by means of a chi-square test for the goodness-of-fit between the false positive rates as expected by Lykken (1988, 1998) and those as estimated from actual data. The false positive rates in actual data were estimated to be generally low in the range of 1% to 7%. On the other hand, Lykken (1988, 1998) expected them to be in the range of 39.5% to 47%. Our analyses indicate that Lykken severely overestimated the false positive rates of CQT and as a result, the basic assumption underlying the use of CQT as a method of lie detection is not as ill-founded as Lykken proposed. The limitations of the present study and further studies to establish the validity of the rationales underlying CQT were discussed.

keywords
polygraph test, comparison question technique(CQT), logical validity, false alarm rate, 거짓말탐지검사, 비교질문검사(CQT), CQT의 논리적 타당성, 오류긍정 비율

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