Episode 50: Science Myths and Misconceptions
The Science of Everything Podcast
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The Relationship Between Arousal and Truth-Telling
A polygraph is a device that measures physiological indices such as blood pressure, pulse and respiration. It doesn't measure lying but can detect when people are lying at greater than chance levels. But in the real world it's not generally accepted anywhere or considered reliable. The false positive rate is so great that it effectively renders the test meaningless.
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