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Critique of Polygraph Validity
The validity and accuracy of polygraph tests are highly questionable. A major criticism is the lack of scientific evidence showing that lying is associated with any single, distinct pattern of physiological arousal. This means that physiological responses measured by the polygraph, such as an increased heart rate, could be caused by other emotions like anxiety or surprise, not necessarily dishonesty.
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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