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Related Experiment Videos

A control question test oriented towards students

M T Bradley1, M E Black

  • 1Department of Psychology, University of New Brunswick, Saint John, Canada. Bradley@Unbsj.ca

Perceptual and Motor Skills
|December 8, 1998
PubMed
Summary

Altering polygraph control questions to focus on student-specific issues like cheating improved accuracy in detecting deception. Innocent students scored as more innocent on these modified tests, enhancing lie detection for mock crimes.

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Area of Science:

  • Psychology
  • Forensic Science
  • Behavioral Science

Background:

  • Polygraph testing is a common method for deception detection.
  • Standard Control Question Tests (CQT) use crime-related questions.
  • Student populations present unique contexts for deception, such as academic dishonesty.

Purpose of the Study:

  • To investigate the efficacy of modified Control Question Tests (CQT) in a student population.
  • To compare the accuracy of CQT using academic dishonesty control questions versus standard crime-related control questions.
  • To determine if altering control questions impacts the detection of deception in mock crimes.

Main Methods:

  • A polygraph examination was administered to 24 students concerning a mock crime.
  • Twelve participants received an altered CQT with control questions focused on cheating and plagiarism.
  • The remaining participants received a standard CQT with crime-oriented control questions.
  • Skin resistance responses were analyzed to derive detection scores.

Main Results:

  • Detection scores significantly differed between innocent (M = 2.0) and guilty (M = -1.9) participants.
  • An interaction was observed between guilt/innocence and the type of CQT used.
  • Participants using student-oriented control questions scored as more innocent when actually innocent (M = 4.3) compared to other conditions.

Conclusions:

  • Modifying CQT with student-relevant control questions can enhance the accuracy of deception detection in this demographic.
  • The study suggests that tailoring control questions to the specific context of the examinee may improve polygraph effectiveness.
  • Further research into context-specific CQT modifications is warranted for improved forensic psychology applications.

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