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Lecture 15

Lecture 15

2 Pages
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Department
Psychology
Course Code
PSYA02H3
Professor
John Bassili

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Lecture 15 Psychology II
Review of Last Lecture
Lie Detection
-based on polygraph
-measure reaction that people cannot control when they are nervous
-measure respiration rate, blood pressure, heart rate, skin resistance
-block respiration when one is nervous
-control question is used to compare emotion (level of emotion) in relevant question
Is Polygraph Accurate?
-has 70 to 85% accuracy
-Lykken identified one problem in polygraph is that innocent people are determined to be guilty
as well
-polygraph is not admitted in court as evidence in Canada because they are unreliable
-a risk that jury may not listen to other evidence and rely solely on polygraph
-too much danger and the technology does not have a high level of accuracy
Can you beat the Test?
-emotion suppression does not work
-the better way is to fake emotion and contract one’s toe
-mimic being emotional
Natural Cues to Lying
-custom officers are asked to identified smuggler and non-smuggler by watching video
-they fail to identify liar because they believe that liar exhibit natural cues, like looking away,
touching nose, and slow in response
-in fact, professional liar can master the skills without showing natural cues above
-Paul Edmund identified facial expression is universal and is linked to autonomic nervous system
-even people that never receive Western education can identify the same emotion
-people are good at what they are expressing so natural cues do not show all emotion
1) Masking- do not show feeling that is inappropriate, like laughing at competitor when he loses
2) Stimulation- show fake feeling, congratulating competitor when he wins
3) Modulation- maximize/ minimize emotion
-people generally have good control over expression
-but people do show micro-expression of fear and happiness that indicate they are telling lie
-micro-expression are intense and fast facial expression that most people miss
-poker player also uses micro-expression to guess what the player’s cards are
Other Indicators to identify Liar
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Description
Lecture 15 Psychology II Review of Last Lecture Lie Detection -based on polygraph -measure reaction that people cannot control when they are nervous -measure respiration rate, blood pressure, heart rate, skin resistance -block respiration when one is nervous -control question is used to compare emotion (level of emotion) in relevant question Is Polygraph Accurate? -has 70 to 85% accuracy -Lykken identified one problem in polygraph is that innocent people are determined to be guilty as well -polygraph is not admitted in court as evidence in Canada because they are unreliable -a risk that jury may not listen to other evidence and rely solely on polygraph -too much danger and the technology does not have a high level of accuracy Can you beat the Test? -emotion suppression does not work -the better way is to fake emotion and contract ones toe -mimic being emotional Natural Cues to Lying -custom officers are asked to identified smuggler and non-smuggler by watching video -they fail to identify liar because they believe that
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