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Examining different types of comparison questions in a field study of CQT polygraph technique: Theoretical and practical implications

Journal of Investigative Psychology and Offender Profiling

Published online on

Abstract

Two types of questions are most important in the CQT polygraph examination, relevant questions that deal directly with the case under query and comparison questions, which usually deal with past probable misdeeds of the examinees that they choose to deny. The simplistic core reasoning behind the CQT is that the risk of being detected for lying is a threatening situation and like any kind of threat, it automatically triggers the autonomic nervous system to respond with the “fight or flight” type of reaction. For the deceptive examinee, the relevant questions pose the main threat, whereas the truthful examinee, knowing that he is telling the truth on the relevant issue while probably lying to the comparison questions, perceives the latter as more threatening, considering his goal to appear truthful on the test. Accordingly, the deceptive examinee reactions are focused on the relevant questions, whereas the truthful focuses them on the comparison ones. Results of the current field study suggest that at least with truthful examinees, comparison questions, which do not incorporate any lies to be afraid of their exposure, or any lies at all, might function similarly to probable lie questions, by just increasing their salience in a manner that presumably creates some concerns about them. Theoretical and practical implications are discussed in line with the RIG strength notion (Ginton, ).