lie detection

Download Lie Detection

Post on 22-Feb-2016




0 download

Embed Size (px)


Lie Detection. Develop skills in reading non-verbal tells Describe the non-verbal cues Identifying the most honest part of the body Know how to detect deception. How We Learn?. Answer the following questions below: What are the 5 senses? What % of sensory information we perceive?. - PowerPoint PPT Presentation


Lie Detection

Lie Detection

1Develop skills in reading non-verbal tellsDescribe the non-verbal cues Identifying the most honest part of the bodyKnow how to detect deception

2How We Learn?Answer the following questions below:What are the 5 senses?What % of sensory information we perceive?

How do we learn?Five SensesSightHearingSmellTouchTastePercent of Information83%11%3.5%1.5%1%Where do you look to see non-verbal clues?ArmFaceHand & FingerLeg & FeetNon-verbal cues of the ArmArmArms upOpen arms

Arm behind backFolded arms

Arm over chairArm around someoneWhat does it tell you?Happiness, positive, joyWelcome, comfort, kindnessSuperiorityAnger, defensive, protectingConfidenceProtectiveNon-verbal cues of the FaceFaceDirect eye contactAvoiding eye contactRaised eye brownBiting lipLip lickingFace blushWhat does it tell you?Positive messageMessage is not important Surprise, disbeliefNervous, AnxiousNervousStressHand & Finger Non-VerbalsHand & FingerResting face in hands

Hidden handsHand shake Open hand

Rubbing hands

Face touchingWhat does it tell you?Genuine interest or boredomDishonestStrength Honesty, Acceptance, SincerityConcern and NervousnessLow Confidence

Leg & Feet Non-verbal cuesLeg & FeetBouncing feetLeg crossing (standing)Leg crossing (seated)

Shoe danglingWhat does it tell?Happy, elatedHigh comfortLeg direction indicates emotion ComfortThe picture below shows what emotion?HappinessAngerSuperiorityLove

[Default][MC Any][MC All]

James is interviewing for a job with your company. Based on his appearance , James is an honest person.TrueFalse

How to detect deception?Nervous fingersSweaty palms and facesEye contact shifting Variations in rate of speechRigid posture Is the person below deceptive?YesNo

Is the person below Deceptive?YesNo

Visual CuesUp and left (Visually constructing images)Up and right (Visually remembering images)To the left (Auditory constructed)To the right (Auditory remembering)Eye Movement

The Person below is Lying.TrueFalse

The Person below is lying.TrueFalse

History of Lie DetectionGreeks would ask questions and feel the subjects pulse.Torture as a means of interrogationIn 1948, following the horrific abuses of World War II, the General Assembly of the United Nations inserted the prohibition against torture in the landmark Universal Declaration of Human RightsThe Supreme Court in 1963 ruled that a confession extracted under truth serum drugs such as sodium pentothal, sodium amytal, and scopolamine - violated a defendant's constitutional right against self-incrimination.

19Current MethodsModern polygraphy: uses physiological changes in the peripheral nervous system (PNS) measure deception

Facial Micro-expressions (developed by Paul Ekman)

Neurotechnological Lie Detection (NTLD):

Advantages over polygraph testing: Fear or other strong emotions may affect physiological responses and thus may confound the data in polygraphy.Polygraphy requires trained experts to read the graphs, while NTLDs would only require computers.

20What is the validity of lie detectors?United States v. Scheffer (1998): A host of studies show that polygraph testing shows 85% to 90% accuracy while critics state that it is 70%. More likely to show innocent people guilty than vice versa. 1. False positive Leads to an incorrect accusation against the communicator. These may be more serious than false negative. 2. False NegativeThe "liar" gets away with the lie. This has been the traditional focusfor assessment of the accuracy of a communication. Polygraph tests can discriminate lying from truth telling at rates well above chance but well below perfection.

There is not a 100% accurate way lie detection method

21But most importantly Always tell the truth!22Youre Detective Poly.1. Start with invasive CONTROL questions to begin to recognize his/her regular behavior.YOU: What class do you have tomorrow?YOU: Who is your favorite musician? Whats the favorite concert you have ever been too?YOU: What restaurants do you recommend? What kind of food do they serve?2. Now lets get to the truth!! Here are some suggested ?sFeel free to ask different ones, but the key is to probe.YOU: Have you ever lied to your best friend? What did you say to them?YOU: Where were you born? What was the name of the hospital? YOU: In the past month, have you deliberately not answered someones phone call? Who was the person?3. DID HE/SHE PASS BASED ON WHAT YOU KNOW?

Youre Suspect SuspicionYou will be asked a set of control questions first that you must answer truthfully for the experimentLet the lying begin! (Note: You may answer all of the questions right or all wrong if you want. This might throw Detective Poly off.)Evaluation from Detective Poly

Now we are going to test your skillsRead over the introductory lab