The polygraph test, still
used widely in the US, measures your heart rate, breathing and blood pressure as
a way to tell how stressed you are feeling. The idea is that the interrogator
asks you questions and when you lie, you get more stressed than when you tell
the truth, and the difference is revealed in the physiological measures. A simple way to cheat the polygraph is to
deliberately distort your physiological readings when telling the truth,
such as by biting your tongue, or imagining an embarrassing incident in the
past. Similar problems afflict brain scan lie detectors, which follow the same
principle of needing a reliable baseline against which to compare signs of
lying.
[By Dr. Christian Jarrett,
BBC Earth. Asia Edition/Vol.9 Issue
1]
Lord, Give
Us Today Our Daily Idea(s)
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