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– We Are Often Taught To Be Polite– Nature of Decoding Task

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

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.

DETECTION VARIABLES

DOES FOREWARNING INCREASE ACCURACY?

DOES EXPERIENCE WITH POTENTIAL LIARS INCREASE ACCURACY?

DOES KNOWLEDGE OF THE LIAR INCREASE ACCURACY?

ARE THERE “HONEST” FACES?

DOES CULTURAL SIMILARITY OF LIAR AND DETECTOR INCREASE ACCURACY?

DOES PROBING INCREASE ACCURACY?

DO PERSONALITY CHARACTERISTICS OF LIAR AND DETECTOR AFFECT ACCURACY?

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

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

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

ADOLESCENTS COULD IDENTIFY ABOUT 50% OF THEIR PARENT’S DETECTION STRATEGIES

THE DISCLOSURE TACTIC WAS NOT OFTEN IDENTIFIED

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

#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

#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

#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

#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

#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