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11 - Countermeasures

Published online by Cambridge University Press:  05 June 2012

By
Gershon Ben-Shakhar
Edited by
Bruno Verschuere ,
Gershon Ben-Shakhar  and
Ewout Meijer
Gershon Ben-Shakhar
Affiliation:
Hebrew University of Jerusalem
Bruno Verschuere
Affiliation:
Universiteit van Amsterdam
Gershon Ben-Shakhar
Affiliation:
Hebrew University of Jerusalem
Ewout Meijer
Affiliation:
Universiteit Maastricht, Netherlands
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Summary

Overview: Countermeasure manipulations performed by guilty suspects pose a major threat to all methods of psychophysiological detection, including the Concealed Information Test (CIT). The present chapter reviews the experimental literature dealing with the effects of various types of countermeasures (physical and mental) on the outcomes of both the Comparison Questions Test (CQT) and the CIT. Most of the studies reviewed demonstrated that it is possible and in fact quite easy to train subjects to produce or enhance their physiological responses to the neutral items in the CIT and the comparison questions in the CQT, and consequently distort the test's outcome. The studies reviewed focused on the effects of both physical and mental countermeasures on various autonomic measures as well as on ERPs. Finally, several means to protect the CIT against the use of countermeasures are raised and discussed.

Introduction

As indicated in previous chapters of this volume as well as in numerous articles, the CIT has great many advantages as a scientifically based method of detecting involvement in criminal or illegal activities (e.g., Ben-Shakhar and Elaad, 2002; 2003; Ben-Shakhar et al., 2002). On the other hand, the CIT is by no means free of obstacles and problems.

One of the most serious deficiencies of the CIT is its vulnerability to the use of countermeasures by guilty or deceptive examinees. Countermeasures are deliberate techniques that might be used by suspects to alter their physiological reactions.

Type
Chapter
Information
Memory Detection
Theory and Application of the Concealed Information Test
 , pp. 200 - 214
Publisher: Cambridge University Press
Print publication year: 2011

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References

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