While that basic concept is sound, the problem - and it's a big one - is that any real effect is lost under a sea of other variables. The idea is that these readings will change based on your stress level as you tell a lie.
#National academies press polygraph skin
They combine readings of blood pressure, respiration, pulse rate, and skin conductance, graphing these out with moving needles on a paper scroll. Polygraph machines haven't changed much since the earliest versions were introduced at the beginning of the twentieth century. So put out that fire on your pants, and sit back.
Unfortunately it's also widely believed to be unreliable and to be inadmissible in a court of law, so today we're going to look at the hard data to see what polygraphs can and cannot do, and what other lie detection techniques may be on the immediate horizon, and how they fare in comparison. For a long time, the standard has been the polygraph machine.
But what we've always longed for is hard data testable, mechanical proof that a subject is telling the truth or lying. A lot of people, like police officers and gamblers, think they can tell when a person is lying.
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