CMS 344K 10-2-08 - CMS 344K Lying and Deception Thursday...

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CMS 344K Lying and Deception Thursday 10-2-08 I. The search for behavior that distinguish liars from the truth tellers a. The search for behavior that liar’s cannot control i. Initially… PPT ii. But now we know: 1. Facial movement is subject to considerable control, but micro expressions, false smiles, and poor timing may be clues to deceit a. Facial expressions get a lot of feedback and anything you get a lot of feedback on, you have a lot of control over – the control over facial expressions is almost as strong as being conscious of the words we say. b. However, the micro-expressions are less likely to notice unless you are highly trained in this i. Ex: Nurses – someone who wants to get out of the hospital and so the nurse asks them if they are still in pain and they say “no”, but quickly they have an expression of pain on their face – even though it is hard to see because it is so quick. 2. Feet/hands/body (when not deliberately used to communicate) are often under less conscious control and may show more “leakage” and/or “deception clues” a. These are more remote in your ability to control them. b. Ex: People typically do not say “How come you have your hands over your legs and you keep moving them back and forth while we are talking?” c. We do not get a lot of feedback because sometimes it would be considered “rude” – more-so for husbands and wives or close relationships. d. Leakage cues: i. You think someone is deceiving you, but you do not know about what. e. Deception cues: i. The person’s behavior indicates what they are deceiving you about. 3. Liars may be the least conscious of their vocal signals a. Ex: Change in “pitch” 4. Attempted control of these behaviors may result in overcompensation a. Ex: Eye Gaze b. Some of the people have less eye contact during deceptive questions c. Some of the people who were really good/practiced liars had the same amount of eye gaze from truthful to deceptive
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d. But the majority of those people do not want to look away too much, but then they end up “looking too much”. They never look away. This signals that something fishy is going on. e. If you do not know what your “normal” behavior is like, you are likely to overcompensate II. What types of lies are studied? a. Primarily:
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This note was uploaded on 01/20/2009 for the course CMS 344K taught by Professor Knapp during the Fall '07 term at University of Texas at Austin.

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CMS 344K 10-2-08 - CMS 344K Lying and Deception Thursday...

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