A lie detector is a physiological recording device called a polygraph. Typical measures of heightened physical change taken include heart rate, breathing rate, skin temperature, and galvanic skin response. The lie detector does not detect lies at all, but rather records physiological changes in response to questions asked by the examiner. The theory is that someone who is guilty will show a greater physiological response when asked critical questions about a crime, compared to control questions. Surprisingly, the polygraph is not as accurate as you might expect. Many studies indicate that the overall accuracy rate is about 70%.
The author of this passage implies that
A) the lie detector is not the best criterion to use to establish absolute guilt.
B) seventy percent is a high accuracy rate.
C) guilty individuals’ responses will increase when asked control questions.
A) the lie detector is not the best criterion to use to establish absolute guilt.
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qué / hacer / tú y tus amigos / después de clase
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