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Mental and physical countermeasures reduce the accuracy of the concealed knowledge test.

Authors
  • Honts, C R
  • Devitt, M K
  • Winbush, M
  • Kircher, J C
Type
Published Article
Journal
Psychophysiology
Publication Date
Jan 01, 1996
Volume
33
Issue
1
Pages
84–92
Identifiers
PMID: 8570798
Source
Medline
License
Unknown

Abstract

The effects of a physical (pressing the toes to the floor) and a mental (counting backward by sevens) countermeasure on the concealed knowledge test (CKT) were examined in a mock crime experiment with 40 subjects. Some knowledgeable subjects were informed about the nature of the CKT and were trained in the use of a countermeasure, whereas others remained uninformed. All subjects were offered a monetary reward if they could produce a truthful outcome. Subjects were tested using standard field techniques and instrumentation. The physical and, to a lesser extent, the mental countermeasures reduced the accuracy of the CKT. These results clearly demonstrate that the CKT has no special immunity to the effects of countermeasures.

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