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Detecting Lies By Use Of A Polygraph The regular conditioning of human beings does not allow them to lie because it is morally and also spiritually wrong. Therefore no human being would want to find themselves lying, but when one is subjected to pressure especially if they are on the downside they are probably going to lie. When one decides to lie their bodies are likely to react which is indicated through various measurable physiological changes that are utilized by lie detecting machines as we get nervous and also anxious. A polygraph is the main machine that has been widely used to detect lies since the machine depends on the physiological changes. Though there are different physiological changes that occur in case one lies there are those that are common, and one such change is the increase in breath rate. Immediately after the rise in the breathing rates shallow breathing which is characterized by decrease in depth of the breath occurs. The polygraph can detect such changes through its pneumograph aspect. When one is lying their blood pressure which represents blood circulation in the body also rises. Again this is easily detected by the polygraph since it possesses cardiographic aspect to measure and identify such signs. Another important sign that someone is lying is the increase in sweat discharge from their bodies. A polygraph has galvanograph aspect which measures the difference in electrical resistance of the subject’s skin. The the method usually measures the electrical conductivity of the skin which is obliged to increase with the increase in an amount of sweat which is the electrolyte, but it does not measure the actual amount of sweat discharged. Increase in the amount of sweat means an increase in concentration of the electrolyte and hence higher conductivity by the skin.
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The polygraph records all the data collected during the test in the form of as graph. In earlier times the polygraphs used to trace the measurements on to a chart paper where after the test the examiner would analyze the results. But in the modern technological era polygraphs are connected to laptops which saves all the information hence eliminating the tiresome work of analyzing the results using papers. Computers also allow one to save significant results for different subjects for later analysis or reference purpose.
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There are other advantages that a digital polygraph has. One of the benefits is that experts have developed a software that helps to ease the process of analyzing data and information. The software includes capabilities to analyze charts and is specifically designed to help the examiners in their analysis. It is advisable that one does not rely on the polygraph as the only test to determine whether the subject is lying.