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Polygraph
A polygraph, also known as a lie detector test, is a device that measures an individual's physiological arousal—such as heart rate, respiration, and sweating—while they answer a set of questions. The test operates on the assumption that dishonesty triggers strong emotional responses, which in turn produce noticeable physiological changes. A trained examiner analyzes the readings, looking for spikes in arousal associated with specific questions as potential indicators that the person may be lying.
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Ch.10 Emotion and Motivation - Psychology @ OpenStax
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Polygraph
Discovering Behavioral Neuroscience
James-Lange Theory of Emotion
Cannon-Bard Theory of Emotion
Imagine you are walking in the woods and encounter a large bear. Your heart begins to pound, your breathing quickens, and you start to tremble. According to theories that propose physical responses are responsible for emotions, which statement best explains the sequence of events leading to your feeling of fear?
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Critique of Polygraph Validity
During an examination that measures physiological arousal, a subject is asked two questions. Question A is, 'Have you ever told a lie?' Question B is, 'Did you take the confidential documents on Tuesday?' The subject's heart rate and skin conductivity show a significantly stronger increase when answering Question B compared to Question A. Based on the fundamental assumption of how this type of examination is designed to work, what is the most likely interpretation of this specific result?
Analysis of a Polygraph Scenario