what is the concept behind lie detector testing?
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Answer:Heartbeat pulse
Explanation:Whenever we lie , our heartbeat increases and the lie detector machine on detecting this tells it to be a lie.
mannan123:
if someone found change in external or internal condition,heart also increases.then?
What do you mean?
heartbeat
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The goal of a lie detector is to see if the person is telling the truth or lying when answering certain questions. When a person takes a polygraph test, four to six sensors are attached to him.
how? what is key concept?
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