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LIE DETECTION ACCURACY

LIE DETECTION ACCURACY. WITHOUT EQUIPMENT AND STRANGERS AS TARGETS, 50-60% IS THE USUAL LEVEL OF ACCURACY WHY AREN’T WE BETTER? Our Evolutionary Past Didn’t Prepare Us Our Parents Often Don’t Teach Us Trust Enriches Life More Than Suspicion We Often Want To Be Misled

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LIE DETECTION ACCURACY

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  1. LIE DETECTION ACCURACY

  2. WITHOUT EQUIPMENT AND STRANGERS AS TARGETS, 50-60% IS THE USUAL LEVEL OF ACCURACY • WHY AREN’T WE BETTER? • Our Evolutionary Past Didn’t Prepare Us • Our Parents Often Don’t Teach Us • Trust Enriches Life More Than Suspicion • We Often Want To Be Misled • We Are Often Taught To Be Polite • Nature of Decoding Task

  3. WHY AREN’T PROFESSIONAL LIE DETECTORS BETTER? • High Base Rate of Liars (+/-75%) • Not As Interested In Spotting Liars As Getting Evidence to Convict • Feedback on Mistakes Is Too Late And Far Removed From Original Judgment To Be of Much Value in Learning

  4. HIGHEST DETECTION RATES • Secret Service Officers • High Stakes Lies • Aphasics • DETECTORS MAY KNOW MORE THAN ACCURACY RATES SUGGEST • THOSE WHO ARE EXTREMELY EFFECTIVE DETECTORS DO NOT HAVE AS MANY FRIENDS OR AS SATISFYING RELATIONSHIPS AS THOSE WHO ARE ONLY MODERATELY ACCURATE.

  5. DETECTION VARIABLES • DOES FOREWARNING INCREASE ACCURACY? • DOES EXPERIENCE WITH POTENTIAL LIARS INCREASE ACCURACY? • DOES KNOWLEDGE OF THE LIAR INCREASE ACCURACY? • ARE THERE “HONEST” FACES?

  6. DOES CULTURAL SIMILARITY OF LIAR AND DETECTOR INCREASE ACCURACY? • DOES PROBING INCREASE ACCURACY? • DO PERSONALITY CHARACTERISTICS OF LIAR AND DETECTOR AFFECT ACCURACY?

  7. DETECTION STRATEGIES FOR PROBING & INTERROGATION • INTIMIDATION • SITUATIONAL FUTILITY • DISCOMFORT AND RELIEF • BLUFF • GENTLE PRODS • MINIMIZATION • CONTRADICTION

  8. ALTERED INFORMATION • CHINK IN THE DEFENSE • POINT OUT DECEPTION CUES • CONCERN • KEEPING THE STATUS QUO

  9. PARENT-ADOLESCENT CHILD STRATEGIES FOR DETECTING DECEPTION • USED: INTIMIDATION, CONTRADICTION, GENTLE PRODS • ALSO USED: SELF-DISCLOSURE • PARENTS STUCK WITH STRATEGY EVEN IF IT DIDN’T WORK • DIFFERENT VERSION OF THE TRUTH BIAS

  10. ADOLESCENTS COULD IDENTIFY ABOUT 50% OF THEIR PARENT’S DETECTION STRATEGIES • THE DISCLOSURE TACTIC WAS NOT OFTEN IDENTIFIED

  11. INTERPERSONAL PERCEPTION TEST • #5 • WHICH PERSON IS TELLING A LIE? • A. THE MAN IS LYING, THE WOMAN IS TELLING THE TRUTH • B. THE MAN IS TELLING THE TRUTH, THE WOMAN IS LYING • C. BOTH THE MAN AND THE WOMAN ARE LYING

  12. #9 • YOU WILL SEE THE SAME WOMAN IN TWO SCENES. WHICH IS THE LIE AND WHICH IS THE TRUTH? • A. THE FIRST IS A LIE, THE SECOND IS THE TRUTH • B. THE FIRST IS THE TRUTH, THE SECOND IS A LIE

  13. #15 • WHICH IS THE LIE AND WHICH IS THE TRUTH? • A. THE FIRST IS A LIE, THE SECOND IS THE TRUTH • B. THE FIRST IS THE TRUTH, THE SECOND IS A LIE

  14. #19 • WHICH IS THE LIE AND WHICH IS THE TRUTH? • A. THE FIRST IS A LIE, THE SECOND IS THE TRUTH • B. THE FIRST IS THE TRUTH, THE SECOND IS A LIE

  15. #24 • WHICH IS THE LIE AND WHICH IS THE TRUTH? • A. THE FIRST IS A LIE, THE SECOND IS THE TRUTH • B. THE FIRST IS THE TRUTH, THE SECOND IS A LIE

  16. #30 • WHICH IS THE LIE AND WHICH IS THE TRUTH? • A. THE FIRST IS A LIE, THE SECOND IS THE TRUTH • B. THE FIRST IS THE TRUTH, THE SECOND IS A LIE • C. BOTH ARE LIES

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