PSYCH 3CC3 Study Guide - Midterm Guide: Lie Detection, Cognitive Load

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17 Feb 2016
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Detecting Deception: Handbook
Page 32
-How Good at Detecting Deception?
oEkman & O’Sullivan (1991)
P’s correctly or incorrectly report positive feelings while watching pleasurable or gruesome
film.
Truth judged by Secret Service, FBI, judges, police, psychiatrists, university students, adults
taking one-day course on deceit.
Videos previously found to contain nonverbal cues to lying: Masking smiles and higher pitch
Judges asked to rate both general lie-detection ability, and their performance in the task.
Only U.S. Secret Service agents judge better than chance, and than all other groups (64%
accuracy)
Accuracy uncorrelated with ratings of general ability or task performance (except for deceit
group)
Possible Shortcomings:
Several earlier studies found no evidence that ‘experts’ better at lie detection than
students.
Forensic relevance unclear: Most forensic lies not about currently felt emotion.
oEkman, O’Sullivan & Frank (1999)
P’s make true or false statements about their opinions on videotape.
U.S. law enforcement officials and psychologists judge honesty while viewing videotapes.
Overall accuracy ranges from 51% (mixed law enforcement officers) to 73% (federal
officers).
Lie accuracy ranges from 48% (mixed law enforcement officers) to 80% (federal officers)
Truth accuracy ranges from 54% (mixed law enforcement officers) to 66% (federal officers)
oWhelan, Wagstaff & Wheatcroft (2015)
Used 36 videos of relatives asking for information about missing or dead relatives.
Half of speakers criminally involved in case (liars), half not (truth tellers).
Participants:
Firearms officers in UK (n=37)
CID officers in UK (n=33)
Undergraduate students (n=37)
Note: Only undergraduate students show the truth bias typically reported in the literature.
Liars Truth-Tellers Combined
Firearms officers 76% 68% 72%
CID officers 77% 68% 72%
Undergraduates 62% 73% 68%
Combined 71% 70% 71%
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