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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?.

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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
How We Learn?

Answer the following questions below:

  • What are the 5 senses?
  • What % of sensory information we perceive?
how do we learn
How do we learn?

Five Senses

Percent of Information






  • Sight
  • Hearing
  • Smell
  • Touch
  • Taste
where do you look to see non verbal clues
Where do you look to see non-verbal clues?
  • Arm
  • Face
  • Hand & Finger
  • Leg & Feet
non verbal cues of the arm
Non-verbal cues of the Arm


What does it tell you?

Happiness, positive, joy

Welcome, comfort, kindness


Anger, defensive, protecting



  • Arms up
  • Open arms
  • Arm behind back
  • Folded arms
  • Arm over chair
  • Arm around someone
non verbal cues of the face
Non-verbal cues of the Face


What does it tell you?

Positive message

Message is not important

Surprise, disbelief

Nervous, Anxious



  • Direct eye contact
  • Avoiding eye contact
  • Raised eye brown
  • Biting lip
  • Lip licking
  • Face blush
hand finger non verbals
Hand & Finger Non-Verbals

Hand & Finger

What does it tell you?

Genuine interest or boredom



Honesty, Acceptance, Sincerity

Concern and Nervousness

Low Confidence

  • Resting face in hands
  • Hidden hands
  • Hand shake
  • Open hand
  • Rubbing hands
  • Face touching
leg feet non verbal cues
Leg & Feet Non-verbal cues

Leg & Feet

What does it tell?

Happy, elated

High comfort

Leg direction indicates emotion


  • Bouncing feet
  • Leg crossing (standing)
  • Leg crossing (seated)
  • Shoe dangling
the picture below shows what emotion
The picture below shows what emotion?
  • Happiness
  • Anger
  • Superiority
  • Love


[MC Any]

[MC All]

james is interviewing for a job with your company based on his appearance james is an honest person
James is interviewing for a job with your company. Based on his appearance , James is an honest person.
  • True
  • False
how to detect deception
How to detect deception?
  • Nervous fingers
  • Sweaty palms and faces
  • Eye contact shifting
  • Variations in rate of speech
  • Rigid posture
visual cues
Visual Cues
  • Up and left (Visually constructing images)
  • Up and right (Visually remembering images)
  • To the left (Auditory constructed)
  • To the right (Auditory remembering)
history of lie detection
History of Lie Detection
  • Greeks would ask questions and “feel the subject’s pulse.”
  • Torture as a means of interrogation
  • In 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 Rights
  • The 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.
current methods
Current Methods

Modern 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.
what is the validity of lie detectors
What 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 Negative

The "liar" gets away with the lie. This has been the traditional focus

for 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
you re detective poly
You’re 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? What’s 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 ?s…Feel 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 someone’s phone call? Who was the person?


you re suspect suspicion
You’re Suspect Suspicion
  • You will be asked a set of control questions first that you must answer truthfully for the experiment
  • Let 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 skills

Now we are going to test your skills……

Read over the introductory lab