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An Experimental Analysis of Children's Ability to Provide a False Report about a Crime
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Memory instructions, vocalization, mock crimes, and concealed information tests with a polygraph.

M T Bradley1, F J Malik, M C Cullen

  • 1Department of Psychology, University of New Brunswick, P.O. Box 5050, Saint John, New Brunswick, E2L 4L5 Canada. Bradley@UNBSJ.ca

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Summary

Polygraph accuracy in concealed information tests (CITs) relies on memory. Priming participants with specific crime details improved CIT accuracy, while lack of detail and unexpected sounds reduced detection rates.

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Area of Science:

  • Forensic Psychology
  • Cognitive Psychology
  • Psychophysiology

Background:

  • Polygraph testing, specifically concealed information tests (CITs), is used to detect deception.
  • The accuracy of CITs is hypothesized to depend on the participant's memory of crime-specific details.
  • Prior research has not fully explored how the specificity of information provided during mock crime instructions influences CIT outcomes.

Purpose of the Study:

  • To investigate the impact of pre-crime information specificity on memory and detection accuracy in concealed information tests (CITs).
  • To examine the influence of unexpected auditory stimuli during a mock crime on memory and CIT performance.
  • To determine the relationship between memory for crime details, detection scores, and overall detection rates.

Main Methods:

  • Participants engaged in a mock crime scenario with varying levels of detail in their instructions regarding crime specifics (e.g., number of boxes).
  • Some participants received explicit numerical details, while others received general descriptions.
  • Unexpected auditory stimuli (victim shouting) were introduced during the mock crime for a subset of participants. An innocent control group was also included.

Main Results:

  • Guilty participants who were not primed with specific crime details exhibited lower memory recall, reduced detection scores, and lower detection rates compared to those who were primed.
  • The presence of unexpected sound during the mock crime affected detection scores but did not significantly impact memory recall.
  • No significant interaction was found between the specificity of crime details and the effect of sound on detection outcomes.

Conclusions:

  • The way crime information is received and encoded significantly limits the effectiveness of concealed information tests.
  • Priming participants with specific, memorable details enhances the potential for accurate detection in CITs.
  • Future research should consider the nuances of information reception and memory encoding in forensic contexts.