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Lie Detector Machines and How They Work The Bible tells us that lying is a breach of the moral law of God, and all people are somehow well aware that it is wrong, whether they believe the Bible or not. However, everyone still lie, despite knowing that it is wrong, especially if put in a situation where you don’t want to be shamed, put down, or accused of something, that is, to help you out of a pressure situation. There are effects that a person who lies experiences, such as being nervous and anxious. And when the person is in this state, there are distinct physiological effects seen in the bodily functions that can be measured by a lie detector machine or a polygraph. A polygraph can measure these effects like the ones given below. When a person is lying, he usually breathes faster and at the same experiences shortness of breath, or shallow breathing. This can be measured by a pnemograph.
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Another physiological effect of lying is an increase in blood pressure and pulse rate. A cardiograph measures this component which are a person’s vital signs.
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Another effect of nervousness and anxiety caused by lying is excessive sweating. The component of the polygraph that measures this is the galvanograph which is the difference in the electrical resistance of the skin as the subject sweats under pressure. When sweating is increased, the electrical conductivity also increases because of the electrolyte concentration found in perspiration. However, the amount of sweat is not measured directly. The results of these measurements are shown in an analog graph. The graph is made by tracings on moving paper rolls. While the measurement is going on, there is an examiner who makes an annotation on the papers showing the results of the polygraph test and when the tests are done, the results are read by the same examiner. Nowadays, analog graphs are no longer in used but are replaced by laptops or desktop computers where lie detector machines are hooked up, and which is very convenient for examiners because there are no more long paper rolls to use in the process. Computers have revolutionized polygraph recordings. Thus, analog polygraphs have already been rendered obsolete and computers are now relied upon because they are more efficient not only in getting results but also in storing the results gathered from the tests of different people in a single place. Digital polygraph machines make use of a very important software program. Their chart analysis feature helps examiners to interpret the results of the polygraph tests. Somehow, results of digital polygraph tests can be inconclusive especially if the test subject has had previous surgeries, illnesses, or is taking drugs, medication, or alcohol.