Lecture 13 Speech and Deception 1

Lecture 13 Speech and Deception 1 - LIN 4930 Speech and...

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LIN 4930 Speech and Deception 1
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Credibility Assessment Definition: Determining the extent to which an individual, or an individual’s communicative acts, are congruent with Are truthful Are deceptive Omit no relevant information (i.e., subject is not concealing information) The term was coined to avoid past failures to successfully detect lies Polygraph
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Polygraph Measures physiological response to stimuli (verbal questions, images, video) Pulse rate Electrodermal response (galvanic skin response)* Breathing rate Deception is not claimed to be directly assessed by the polygraph, simply arousal level associated with psychological stress Stress, in turn, is supposed to indicate deception depending on a format of questioning and a comparing of physiological responses from one question to another
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Physiological response
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Polygraph Question types in simplest type of polygraph test Control: A question that is supposed to always elicit a lie from any subject Irrelevant Relevant Example: The following questions might be asked of a applicant for a position that requires a security clearance, named “Bryan." Q1- Do people sometimes call you Bryan? (Irrelevant) Q2- Did you ever lie to a person in authority? (Control)
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Lecture 13 Speech and Deception 1 - LIN 4930 Speech and...

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