The role of prior expectations in polygraph examiners decisions

Eitan Elaad, Avital Ginton, Gershon Ben-Shakhar

Research output: Contribution to journalArticlepeer-review


In the present experiment, prior expectations were manipulated to examine whether and to what extent polygraph examiners' judgment is affected by their expectations. Each of seven experienced police polygraph examiners examined four innocent subjects suspected of cheating on an aptitude test. The examiners were led to believe that two subjects are probably guilty and the other two are probably innocent. No relationship was found between the final judgment of the examiners and their prior expectations.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalPsychology, Crime and Law
Issue number1
StatePublished - 1998
Externally publishedYes


  • Control question technique
  • Hypothesis-confirmation bias
  • Polygraph
  • Prior expectations


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