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Practical methods for detecting mendacity: a case study.

A R Hirsch1, C J Wolf

  • 1Department of Neurology, Rush-Presbyterian-St Luke's Medical Center, Chicago, IL, USA.

The Journal of the American Academy of Psychiatry and the Law
|January 12, 2002
PubMed
Summary
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This study identified 23 objective signs of deception in President Clinton's testimony. Increased frequencies of these signs correlated with mendacity, suggesting potential use in veracity assessments.

Area of Science:

  • Forensic Psychology
  • Behavioral Analysis
  • Legal Psychology

Background:

  • This study investigated objective verbal and nonverbal indicators of deception during testimony.
  • It analyzed President Clinton's Grand Jury testimony for 23 specific signs of dissimulation, drawing from extensive literature on mendacity.

Discussion:

  • The research compared the frequency of these signs during a segment later found to be false against control periods within the same testimony and an external control (a fundraising speech).
  • Statistical analysis revealed a significant increase in the occurrence of most deceptive signs during the mendacious segment.

Key Insights:

  • A marked increase in 20 out of 23 observed signs of dissimulation was noted during the mendacious portion of the testimony compared to a fundraising speech.
  • Nineteen of these signs showed a significant increase when compared to a control period within the same testimony.

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Outlook:

  • The identified 23 signs show promise as indicators for assessing the veracity of recorded and scripted testimony.
  • Further research and practice could enable psychiatrists to utilize these indicators in interviews for truth verification.